Patrick Not-Star is a starfish who looks like Patrick from behind. He only appeared in Hide and Then What Happens? when SpongeBob was looking for Patrick, but he was missing SpongeBob. Patrick Not-Star seems to be more intelligent than Patrick. He lives in The End of the World where he meets SpongeBob. He then asks SpongeBob for a dollar (inferring that he has no money like Patrick).
Patrick Not-Star looks like Patrick usually, except with facial hair and a nose. He has brown eyebrows, a mustache, a beard, and a big nose (Patrick had one until it "wilted").