Incidental 11 is a background character who is one of Pearl's friends. She makes many cameo appearances throughout the series, starting in the episode "Squeaky Boots," in which she comes to Pearl's birthday party. She was originally a teenaged character, but has since been seen as a grown-up citizen of Bikini Bottom.
According to Vincent Waller on Twitter, she may be the mother of Squidina, another squid who is also Pearl's friend, though this is not officially confirmed.
She is a dark gray squid with light yellow eyes and black pupils. She wears a red plaid skirt with yellow stripes. In "Squeaky Boots" and several other early appearances, she has seven limbs. In later episodes, she has six limbs. Actual squids have ten limbs, unlike her.
In "Friend or Foe," she is light green with a blue skirt.
Role in series
She is one of Pearl's friends at her birthday. When Pearl talks about the new flipper slippers, she can be seen wearing them.
She is one of the teenaged customers who comes to eat at Pearl's redesigned Kuddly Krab. She is voiced by Sirena Irwin in this appearance and says "Finally. A cool place for teens to just, you know, hang out!"
She seems to be one of the few citizens that have never set foot in the Krusty Krab, even though she has been seen there before. When Mr. Krabs shows a picture of her and asks SpongeBob if he has seen her before, he says no. At the end of the episode, she is among a mob of citizens that fell off the highway when Patrick and SpongeBob try to get customers into the Krusty Krab.