Seaweed Man, also known as Mr. Seaweed Monster Man, is a creature who only appears in the episode "That's No Lady."
He is a seaweed monster with seaweed for hair, and he wears seaweed. He has red lips, light orange arms, light orange, red, and yellow legs, and a red and yellow colored nose.
Role in episode
When Patrick, who is trying to create a new identity for himself because he believes he is the target of an assassin, suggests to become "Mr. Seaweed Monster Man," SpongeBob indicates that there has already been a Mr. Seaweed Monster Man, at which point Seaweed Man appears and says "Hey!" and waves to SpongeBob and Patrick.