Mr. Sun is a version of the sun that has a face. There have been four incarnations of this character. One appears in "Procrastination," another appears in "Best Day Ever" and "Sold!," one appears in "SpongeHenge," and another appears in "Sandy's Nutmare" with SpongeBob-like characteristics.
This version of Mr. Sun only has a drawn-on face. It does not move or talk.
"Best Day Ever"/"Sold!"
This version is round, yellow, and orange, and has a smile.
This version has the face of Dee Bradley Baker.
It is light yellow, square, and resembles SpongeBob.
Role in series
Mr. Sun appears when SpongeBob looks out the window and sees people playing on a playground, with Mr. Sun in the corner. This occurs when SpongeBob is procrastinating on writing his essay.
"Best Day Ever"
Mr. Sun singing appears during SpongeBob's happy song.
Mr. Sun appears in the sky saying "Time for work, SpongeBob" with a live-action face.
Mr. Sun appears during Squidward's happy song.
Mr. Sun appears in Shalmon's story about how a star was "able to keep the sun and the moon happy without wearing himself out" to Sandy, SpongeBob, and Patrick