In addition to the ten main characters, SpongeBob SquarePants has a large amount of background characters. They are identified by the artists and animators with individual model numbers. These model numbers correspond to when the characters were designed in production. The following is a list of background characters, sorted by their model numbers.
"Squeaky Boots," the second episode made for season 1 in production order (code #102), was the first produced episode to feature incidental characters. As a result, the first row of incidentals (incidentals 1-11) were all first designed for "Squeaky Boots."
Some characters, such as Incidental 35 and Incidental 70, were removed from the model sheets, mainly between the second and fourth seasons. Like most animated series, many SpongeBob episodes are worked on at the same time, leading to several incidentals with later numbers appearing in episodes before others with earlier numbers.
Regular Incidentals
| Number | Image | Debut (production order) |
|---|---|---|
| Incidental 1 (Fred) |
| "Squeaky Boots" (episode 102) |
| Incidental 2 | 
| "Squeaky Boots" (episode 102) |
| Incidental 3 | 
| "Squeaky Boots" (episode 102) |
| Incidental 4 | 
| "Squeaky Boots" (episode 102) |
| Incidental 5 | 
| "Squeaky Boots" (episode 102) |
| Incidental 6 | 
| "Squeaky Boots" (episode 102) |
| Incidental 7 | 
| "Squeaky Boots" (episode 102) |
| Incidental 8 | 
| "Squeaky Boots" (episode 102) |
| Incidental 9 | 
| "Squeaky Boots" (episode 102) |
| Incidental 10 | 
| "Squeaky Boots" (episode 102) |
| Incidental 11 | 
| "Squeaky Boots" (episode 102) |
| Incidental 12 | 
| "Ripped Pants" (episode 106) |
| Incidental 13 | 
| "Ripped Pants" (episode 106) |
| Incidental 14 | 
| "Ripped Pants" (episode 106) |
| Incidental 15 | 
| "Ripped Pants" (episode 106) |
| Incidental 16 | 
| "Ripped Pants" (episode 106) |
| Incidental 17 | 
| "Ripped Pants" (episode 106) |
| Incidental 18 | 
| "Squeaky Boots" (episode 102) |
| Incidental 19 | Unknown | |
| Incidental 20 | 
| "Ripped Pants" (episode 106) |
| Incidental 21 | 
| "Ripped Pants" (episode 106) |
| Incidental 22 | 
| "Ripped Pants" (episode 106) |
| Incidental 23 | 
| "Ripped Pants" (episode 106) |
| Incidental 24 | 
| "Ripped Pants" (episode 106) |
| Incidental 25 | 
| "Boating School" (episode 104) |
| Incidental 26 | 
| "Boating School" (episode 104) |
| Incidental 27 | 
| "Boating School" (episode 104) |
| Incidental 28 | 
| "Hall Monitor" (episode 108) |
| Incidental 29 | 
| "Ripped Pants" (episode 106) |
| Incidental 30 | 
| "Ripped Pants" (episode 106) |
| Incidental 30A | 
| "Culture Shock" (episode 122) |
| Incidental 31 | 
| "Ripped Pants" (episode 106) |
| Incidental 32 | 
| "Ripped Pants" (episode 106) |
| Incidental 33 | 
| "Sandy's Rocket" (episode 110) |
| Incidental 34 | 
| "Ripped Pants" (episode 106) |
| Incidental 35 | 
| "Ripped Pants" (episode 106) |
| Incidental 36 | 
| "Ripped Pants" (episode 106) |
| Incidental 37A | 
| "Ripped Pants" (episode 106) |
| Incidental 37B | 
| "Ripped Pants" (episode 106) |
| Incidental 38 (Scooter) | 
| "Ripped Pants" (episode 106) |
| Incidental 39 | 
| "Ripped Pants" (episode 106) |
| Incidental 40 | 
| "Ripped Pants" (episode 106) |
| Incidental 41 | 
| "Ripped Pants" (episode 106) |
| Incidental 42 | 
| "Ripped Pants" (episode 106) |
| Incidentals 43-44 | Unknown | |
| Incidental 45 | 
| "Ripped Pants"(episode 106) |
| Incidental 46 | 
| "Ripped Pants" (episode 106) |
| Incidental 47 | 
| "Ripped Pants" (episode 106) |
| Incidental 48 | 
| "Ripped Pants" (episode 106) |
| Incidental 49 | 
| "Ripped Pants" (episode 106) |
| Incidental 49A | 
| "Opposite Day" (episode 112) |
| Incidentals 050-059 | Unknown | |
| Incidental 60 | 
| "Pickles" (episode 111) |
| Incidental 61 | 
| "Pickles" (episode 111) |
| Incidental 62 | 
| "Pickles" (episode 111) |
| Incidental 63 | 
| "Pickles" (episode 111) |
| Incidental 64 | 
| "Pickles" (episode 111) |
| Incidental 65 | 
| "Pickles" (episode 111) |
| Incidental 66 | 
| "Valentine's Day" (episode 128) |
| Incidental 67 | 
| "Pickles" (episode 111) |
| Incidental 68 | 
| "Pickles" (episode 111) |
| Incidental 69 | 
| "Pickles" (episode 111) |
| Incidental 70 | 
| "Pickles" (episode 111) |
| Incidental 71 | 
| "Pickles" (episode 111) |
| Incidental 72 | Unknown | |
| Incidental 73 | 
| "Pickles" (episode 111) |
| Incidentals 74-079 | Unknown | |
| Incidental 80 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 81 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 82 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 83 (Old Man Walker) | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 84 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 85 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 86 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 87 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 088 or 089 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 088 or 089 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 90 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 91 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 92 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 93 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 94 | 
| "Mermaid Man and Barnacle Boy" (episode 119) |
| Incidental 95, 99, or 101 |
| "Valentine's Day" (episode 128) |
| Incidental 96 |
| "Valentine's Day" (episode 128) |
| Incidental 97 | 
| "Valentine's Day" (episode 128) |
| Incidental 98 |
| "Valentine's Day" (episode 128) |
| Incidental 95, 99, or 101 |
| "Valentine's Day" (episode 128) |
| Incidental 100 |
| "Valentine's Day" (episode 128) |
| Incidental 95, 99, or 101 |
| "Valentine's Day" (episode 128) |
| Incidental 102 | 
| "Valentine's Day" (episode 128) |
| Incidental 103 | 
| "Valentine's Day" (episode 128) |
| Incidental 104 | 
| "Valentine's Day" (episode 128) |
| Incidental 105 | 
| "Valentine's Day" (episode 128) |
| Incidental 106 | 
| "Valentine's Day" (episode 128) |
| Incidental 107 | 
| "Valentine's Day" (episode 128) |
| Incidental 108 | 
| "Valentine's Day" (episode 128) |
| Incidental 109 | 
| "Valentine's Day" (episode 128) |
| Incidentals 110-113 | Unknown | |
| Incidental 114 | 
| "F.U.N." (episode 121) |
| Incidental 115 | 
| "F.U.N." (episode 121) |
| Incidental 116 | 
| "I Was a Teenage Gary" (episode 117) |
| Incidental 117 | Unknown | |
| Incidental 118 | 
| "Hall Monitor" (episode 108) |
| Incidental 119 | 
| "SB-129" (episode 129) |
| Incidentals 120-149 | Unknown | |
| Incidental 150 | 
| "Bossy Boots" (episode 148) |
| Incidental 151 | 
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental 152 | 
| "Patty Hype" (episode 152) |
| Incidental 153 | 
| "The Smoking Peanut" (episode 163) |
| Incidental 154 | 
| "Something Smells" (episode 143) |
| Incidental 155 | 
| "Ripped Pants" (episode 106) |
| Incidental 156 (Sandals) | 
| "Patty Hype" (episode 152) |
| Incidental 157 | 
| "F.U.N." (episode 121) |
| Incidental 158 | 
| "Prehibernation Week" (episode 151) |
| Incidental 159 | Unknown | |
| Incidental 160 | 
| "The Incredible Shrinking Sponge" |
| Incidental 161 | Unknown | |
| Incidental 162 | 
| "The Incredible Shrinking Sponge" |
| Incidentals 163-168 | Unknown | |
| Incidental 169 | 
| "Pat the Horse" |
| Incidental 170 | Unknown | |
| Incidental 171 | 
| "The Grill is Gone" |
| Incidentals 172-185 | Unknown | |
| Incidental 186 | 
| "Treats!" |
| Incidentals 187-199 | Unknown | |
| Incidental 200 | 
| "Rock Bottom" (episode 138) |
| Incidental 201 | 
| "Rock Bottom" (episode 138) |
| Incidental 202 | 
| "Rock Bottom" (episode 138) |
| Incidental 203 | Unknown | |
| Incidental 204 | 
| "Rock Bottom" (episode 138) |
| Incidental 205 | Unknown | |
| Incidental 206 | 
| "Rock Bottom" (episode 138) |
| Incidentals 207-210 | Unknown | |
| Incidental 211 | 
| "Rock Bottom" (episode 138) |
| Incidental 212 | 
| "Rock Bottom" (episode 138) |
| Incidental 213 | Unknown | |
| Incidental 214 | 
| "Rock Bottom" (episode 138) |
| Incidentals 215-219 | Unknown | |
| Incidental 220 | 
| "Rock Bottom" (episode 138) |
| Incidental 221 | 
| "Rock Bottom" (episode 138) |
| Incidental 222 | 
| "Rock Bottom" (episode 138) |
"F__" Incidentals
The F incidentals (likely standing for Fancy) are a group of fancy fish designed for "Culture Shock." Some of these fish are actually regular incidentals but with minor edits and fancy suits (Fred, Incidental 2, Incidental 15, Incidental 23, and Incidental 63).
| Number | Image | Debut |
|---|---|---|
| Incidental F1 |
| "Culture Shock" (episode 122) |
| Incidental F2 |
| "Culture Shock" (episode 122) |
| Incidental F3 | Unknown | |
| Incidental F4 |
| "Culture Shock" (episode 122) |
| Incidental F5 | Unknown | |
| Incidental F6 |
| "Culture Shock"
(episode 122) |
| Incidentals F7-8 |
Unknown | |
| Incidental F9 |
| "Culture Shock"
(episode 122) |
| Incidentals F10-13 |
Unknown | |
| Incidental F14 |
| "Culture Shock"
(episode 122) |
| Incidentals F15-16 |
Unknown | |
| Incidental F17 | 
| "Culture Shock"
(episode 122) |
| Incidental F18 | 
| "Culture Shock"
(episode 122) |
"Teen" Incidentals
These Incidentals first appear in "The Chaperone".
| Number | Image | Debut |
|---|---|---|
| Teens 1-3 |
Unknown | |
| Teen 4 |
| "The Chaperone" (episode 113) |
| Teen 5 |
| "The Chaperone" (episode 113) |
| Teen 6 |
Unknown | |
| Teen 7 |
| "The Chaperone" (episode 113) |
| Teen 8 |
| "The Chaperone"
(episode 113) |
| Teen 9 |
| "The Chaperone"
(episode 113) |
| Teen 10 | 
| "The Chaperone"
(episode 113) |
| Teen 11 |
| "The Chaperone"
(episode 113) |
| Teen 12 |
| "The Chaperone"
(episode 113) |
"Pirate" Incidentals
A crew made out of four pirates first appear in "Dying for Pie." The third pirate is the captain. An additional group of pirate Incidentals were added to this group for "Grandpappy the Pirate", those are edits of pre-existing character models with new pirate outfits.
| Number | Image | Debut |
|---|---|---|
| Pirate 1 |
| "Dying for Pie" (episode 147) |
| Pirate 2 |
| "Dying for Pie" (episode 147) |
| Pirate 3 |
| "Dying for Pie" (episode 147) |
| Pirate 4 |
| "Dying for Pie" (episode 147) |
| Pirates 5-7 | Unknown | |
| Pirate 8 |
| "The Fry Cook Games" (episode 171) |
| Pirate 9 |
| "No Weenies Allowed" episode 200) |
| Pirates 10-11 | Unknown | |
| Pirate 12 |
| "Plankton's Army" episode 211) |
"G__" Incidentals
These nerdy looking Incidentals first appear in "I'm Your Biggest Fanatic." The "G" in their names likely stand for Geek.
| Number | Image | Debut |
|---|---|---|
| Incidental G1 |
Unknown | |
| Incidental G2 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G3 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G4 |
Unknown | |
| Incidental G5 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G6 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G7 | 
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G8 |
Unknown | |
| Incidental G9 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidentals G10-11 | Unknown | |
| Incidental G12 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G13 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G14 |
Unknown | |
| Incidental G15 |
| "I'm Your Biggest Fanatic" (episode 159) |
| Incidental G16-18 |
Unknown | |
| Incidental G19 |
| "I'm Your Biggest Fanatic" (episode 159) |
"K__" Incidentals
These incidentals first appear in the "Friend or Foe" flashbacks, along with other regular incidentals reduced to the size of a child. The "K" very likely stands for kid. This is also the only incidental sheet where every member in it is known.
| Number | Image | Debut |
|---|---|---|
| Incidental K1 | 
| "Friend or Foe" (episode 501) |
| Incidental K2 |
| "Friend or Foe" (episode 501) |
| Incidental K3 |
|
"Friend or Foe"(episode 501) |
| Incidental K4 |
| "Friend or Foe" (episode 501) |
| Incidental K5 |
| "Friend or Foe" (episode 501) |
| Incidental K6 |
| "Friend or Foe" (episode 501) |
"Viking" Incidentals
| Number | Image | Debut |
|---|---|---|
| Viking 1 | 
| "Dear Vikings" (episode 631) |
| Viking 2 | 
| "Dear Vikings" (episode 631) |
| Viking 3 | 
| "Dear Vikings" (episode 631) |
| Viking 4 |
Unknown | |
| Viking 5 | 
| "Dear Vikings" (episode 631) |
| Viking 6 | 
| "Dear Vikings" (episode 631) |
| Viking 7 |
Unknown | |
| Viking 8 | 
| "Dear Vikings" (episode 631) |
| Viking 9 | 
| "Dear Vikings" (episode 631) |
| Vikings 10-11 |
Unknown | |
| Viking 12 | 
| "Dear Vikings" (episode 631) |
"A__" Incidentals
These Incidentals have only appeared in The SpongeBob Movie: Sponge Out of Water and the "Thank Gosh It's Monday" short. The "A" likely stands for Apocalyptic.
|
Number | Image | Debut |
|---|---|---|
| Incidental A1 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A2 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A3 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A4 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A5 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A6 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A7 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A8 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A9 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A10 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A11 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A12 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A13 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A14 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A15 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A16 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A17 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A18 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A19 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A20 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A21 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A22 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A23 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A24 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A25 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A26 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A27 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A28 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A29 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A30 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A31 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A32 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A33 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A34 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A35 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A36 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A37 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A38 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A39 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A40 | 
| The SpongeBob Movie: Sponge Out of Water |
| Incidental A41 | 
| The SpongeBob Movie: Sponge Out of Water |
Unnumbered Apocalyptic Incidentals
An unnumbered duo of Apocalyptic Incidentals are neither regular Incidentals nor "A__" Incidentals.
| Number | Image | Debut |
|---|---|---|
| Poison Fish | 
| The SpongeBob Movie: Sponge Out of Water |
| Visual Aids | 
| The SpongeBob Movie: Sponge Out of Water |
"BM__" Incidentals
In the rough Storyboards for "Stuck on the Roof" and SpongeBob's Place," three fish with the labels of "BM__" (which likley stand for Businessmen) appered with models that are recycled from older ones. The first apperences of these Incidentals was likley "The Executive Treatment."
| Number | Image | Debut (production order) |
|---|---|---|
| Incidentals BM1-36 |
Unknown | |
| Incidental BM37 | 
| "Ripped Pants" (episode 106) |
| Incidentals BM38-40 |
Unknown | |
| Incidental BM41 |
| "Ripped Pants" (episode 106) |
| Incidentals BM42-49 |
Unknown | |
| Incidental BM50 |
| "Can You Spare a Dime" (episode 190) |
"D__" Incidentals
| Number | Image | Debut |
|---|---|---|
| Incidental D1 |
| "Code Yellow" |
| Incidental D2 |
| "Code Yellow" |
| Incidental D3 |
| "Code Yellow" |
| Incidental D4 |
| "Code Yellow" |
| Incidental D5 |
Unknown | |
| Incidental D6 |
| "Code Yellow" |
| Incidental D7 |
| "Code Yellow" |
| Incidental D8 |
Unknown | |
| Incidental D9 |
| "Code Yellow" |
| Incidental D10 |
| "Code Yellow" |
| Incidental D11 |
| "Code Yellow" |
| Incidental D12 |
| "Code Yellow" |
| Incidental D13 | 
| "Code Yellow" |
| Incidental D14 |
| "Code Yellow" |
| Incidental D15 |
| |
| Incidental D16 |
| "Code Yellow" |
"M__" Incidentals
A total of five incidentals whose model numbers start with "M" (possibly standing for musician) appear in "Krusty Katering." They are recycled from other models, just recolored and dressed up with suits. Only three numbers are known: M2, M3, and M4.
| Number | Image | Debut |
|---|---|---|
| Brown eel
(Incidental M1 or M5) |
| "Your Shoe's Untied" (episode 142) |
| Incidental M2 |
| "Code Yellow" |
| Incidental M3 |
| "The Krusty Sponge" (episode 519) |
| Incidental M4 |
| "Code Yellow" |
| Yellow musician
(Incidental M1 or M5) |
| "Code Yellow" |
"NF__" Incidentals
A total of 7 well dressed fish marked with a "NF" (possibly standing for "New Fancy") made their debut in "Krusty Katering."
| Number | Image | Debut |
|---|---|---|
| Incidental NF1 |
| "Krusty Katering" |
| Incidental NF2 |
| "Krusty Katering" |
| Incidental NF3 |
| "Krusty Katering" |
| Incidental NF4 |
| "Krusty Katering" |
| Incidental NF5 |
| "Krusty Katering" |
| Incidental NF6 |
| "Krusty Katering" |
| Incidental NF7 |
| "Krusty Katering" |
"PM__" Incidentals
| "You think I'm special!"
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| Number | Image | Debut |
|---|
This list is incomplete, but you can help Encyclopedia SpongeBobia by expanding it.
"C__" Incidentals
A total of at least 22 clown incidentals were designed for "Don't Feed the Clowns".
| Number | Image | Debut |
|---|---|---|
| Incidentals C1-C8 |
Unknown | |
| Incidental C9 | 
| "Don't Feed the Clowns" |
| Incidentals C10-C11 |
Unknown | |
| Incidental C12 | 
| "Don't Feed the Clowns" |
| Incidental C13A |
Unknown | |
| Incidental C13B | 
| "Don't Feed the Clowns" |
| Incidental C14 | 
| "Don't Feed the Clowns" |
| Incidental C15 | 
| "Don't Feed the Clowns" |
| Incidental C16 | 
| "Don't Feed the Clowns" |
| Incidental C17 | 
| "Don't Feed the Clowns" |
| Incidentals C18-C19 |
Unknown | |
| Incidental C20 | 
| "Don't Feed the Clowns" |
| Incidental C21 | 
| "Don't Feed the Clowns" |
| Incidental C22 | 
| "Don't Feed the Clowns" |
"BB__" Incidentals
These fish children were designed for "Old Man Patrick" for the scene when SpongeBob and the elders go to the arcade. They later reappear in "Insecurity Guards" and "The Goofy Newbie."
| Number | Image | Debut |
|---|---|---|
| Incidental BB1 | 
| "Old Man Patrick" |
| Incidental BB2 |
Unknown | |
| Incidental BB3 | 
| "Old Man Patrick" |
| Incidental BB4 | 
| "Old Man Patrick" |
| Incidental BB5 |
Unknown | |
| Incidental BB6 | 
| "Old Man Patrick" |
| Incidentals BB7-9 |
Unknown | |
| Incidental BB10 | 
| "Old Man Patrick" |
| Incidental BB11 | 
| "Old Man Patrick" |
| Incidental BB12 |
Unknown | |
| Incidental BB13 | 
| "Old Man Patrick" |
| Incidental BB14 | 
| "Old Man Patrick" |
| Incidental BB15 | 
| "Old Man Patrick" |
| Incidental BB16 |
Unknown | |
| Incidental BB17 | 
| "Old Man Patrick" |
| Incidental BB18 | 
| "Old Man Patrick" |
| Incidental BB19 | 
| "Old Man Patrick" |
| Incidental BB20 | 
| "Old Man Patrick" |
| Incidental BB21 |
Unknown | |
| Incidental BB22 | 
| "Old Man Patrick" |
| Incidental BB23 | 
| "Old Man Patrick" |
"HB__" Incidentals
These hillbilly characters (which is likley what the "HB" stands for) were designed for the Wagon Wheel hoedown sequence in "Karen's Virus". One of them is based on an older model.[1]
| Number | Image | Debut |
|---|---|---|
| Incidental HB1 | 
| "Karen's Virus" |
| Incidental HB2 | 
| "Karen's Virus" |
| Incidental HB3 | 
| "Karen's Virus" |
| Incidental HB4 | 
| "Karen's Virus" |
| Incidental HB5 | 
| "Karen's Virus" |
| Incidental HB6 | 
| "Karen's Virus" |
"EHS__" Incidentals
These fish make up the members of the Empty Head Society in "The Nitwitting." Four of them are recycled from older models, and one of those recycled models has a different labeling to the rest.
| Number | Image | Debut |
|---|---|---|
| Incidental EHS1 |
| "The Nitwitting" |
| Incidental EHS2 |
| "The Nitwitting" |
| Incidental EHS3 |
| "The Nitwitting" |
| Incidental EHS4 |
| "The Nitwitting" |
| Incidental EHS5 |
| "Walking Small "(episode 133) |
| Incidental EHS6 |
| "The Nitwitting" |
| Incidental EHS7 |
| "Ripped Pants" (episode 106) |
| Incidental EHS8 |
| "The Nitwitting" |
| Incidental EHS9 |
| "The Nitwitting" |
| Incidental EHS10 |
| "Mutiny on the Krusty" |
| Incidental EHS11 |
| "The Nitwitting" |
| Incidental EHS12 |
| "The Nitwitting" |
| Incidental EHS13 |
| "The Nitwitting" |
| Incidental EHS14 |
| "The Nitwitting" |
| Incidental EHS15 | 
| "The Nitwitting" |
| Incidental EHS16 | 
| "The Nitwitting" |
| Incidental 001-ish | 
| "Squeaky Boots" (episode 102) |
"CM__" Incidentals
These fish appear in "Mind the Gap" Some of them are recycled from older models, and the "CM" might stand for "Club Member" or "Cool Music."
| Number | Image | Debut |
|---|---|---|
| Incidental CM1 |
| "Mind the Gap" |
| Incidental CM2 |
| "Mind the Gap" |
| Incidental CM3 |
| "Mind the Gap" |
| Incidental CM4 |
| "Mind the Gap" |
| Incidental CM5 |
Unknown | |
| Incidental CM6 |
| "Mind the Gap" |
| Incidental CM7 |
Unknown | |
| Incidental CM8 |
| "Mind the Gap" |
| Incidental CM9 |
| "Mind the Gap" |
| Incidental CM10 |
| "Mind the Gap" |
| Incidental CM11 |
| "Mind the Gap" |
| Incidental CM12 |
| "The Chaperone" (episode 113) |
| Incidental CM13 |
| "Sing a Song of Patrick" (episode 520) |
| Incidental CM14 |
| "Pickles" (episode 111) |
| Incidental CM15 |
| "Krab Borg" (episode 197) |
| Incidental CM16 |
| "Culture Shock" (episode 122) |
| Incidental CM17 |
| "Mind the Gap" |
| Incidental CM18 |
Unknown | |
| Incidental CM19 |
| "The Sponge Who Could Fly" (episode 217) |
| Incidental CM20 |
| "The Chaperone" (episode 113) |
| Incidental CM21 |
| "The Chaperone" (episode 113) |
| Incidental CM22 |
| "Goodbye, Krabby Patty?" |
| Incidental CM23 |
| "Sing a Song of Patrick" (episode 520) |
| Incidental CM24 |
| "Sing a Song of Patrick" (episode 520) |
"RL__" Incidentals
At least ten "RL" incidentals were created for SpongeBob in RandomLand. Only one model number is known.
| Number | Image | Debut |
|---|---|---|
| Incidentals RL1-9 |
Unknown | |
| Incidental RL10 |
| "SpongeBob in RandomLand" |
Trivia
- Most background characters have two models: one for their daytime color palette and another for their nighttime color palette. For example, Fred's palettes are labeled "001-DAY" and "001-NIGHT."
- According to Jay Lender, several of the original incidental characters were removed from the model sheets during the second season after their models were lost in the shuffle during revisions.[2] As a result, many episodes featuring them in storyboards (such as "Christmas Who?" and "Mermaid Man and Barnacle Boy III") had them replaced with different character models.
- The numbers for these characters are known from storyboards. Specifically, numbers 33, 35, 61, 62, 70, and 71 are known from the storyboards of "Christmas Who?."
- It's been proven possible that if a removed incidental has its model retrieved it could return to the show and stay. For example, Incidentals 95-101 returned by "The Inmates of Summer" and Incidental 33 returned by "Patrick's Tantrum". Why the official model sheets haven't updated since then is unknown.
- Fred, Scooter, Sandals, and Old Man Walker are currently the only incidental characters with official confirmed names by the SpongeBob crew. Other characters have been given various names throughout the show, but these are limited to single instances and do not carry over to other episodes.
- The models for Incidentals 30 and 30A are redraws of the anchovies from "Help Wanted." Unlike the anchovies in "Help Wanted," these incidentals are solid blue and brown, and the brown anchovies have blue shirts instead of white ones.
- In many episodes, duplicate background character fish can be seen in crowds.
Gallery
Each incidental has a separate character model. At various points in the show's production, the models have been compiled onto model sheets, separate from the Main Model Pack also used by the animators. The earliest known sheet for the regular incidentals divided them by their appearances. For example, tall rounded fish were grouped together under a category called "hotdogs."
Before the production of The SpongeBob Movie: Sponge Out of Water, another compilation sheet was made, this time listing the characters in order of number. The sheet has gaps for the numbers of removed incidentals, who are incorrectly labeled as "non-existant" (sic). Vincent Waller uploaded the pages of this sheet to his Twitter account in February 2018, and Adam Paloian uploaded photographed sheets to his Twitter account in April 2019.
The character models for the Rock Bottomites were in the files of the PS1 version of SuperSponge. Adam Paloian uploaded to his Twitter Incidental F4's character model on August 1, 2017, two hillbilly sheets in November 2018, and three Empty Head Society sheets in January 2019.
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