This list refers to characters within a Nickelodeon series, usually minor ones, who have a noticeably similar appearance to one of the regular characters. This does not include look-alike characters who are already related to each other such as Arnie (Arnold's cousin).
Clones
Me Two
Clone of SpongeBob SquarePants Appears in the SpongeBob SquarePants episode "CopyBob DittoPants"