Barnacle Boy is the sidekick of Mermaid Man. He and Mermaid Man have been superheroes for a rather long time, and it is revealed Barnacle Boy is 68 years old in the episode "Mermaid Man and Barnacle Boy V."
Barnacle Boy is tall, thin, bald, has a very large nose (similar to but bigger than Squidward's), he has puffy ears, a small sailor hat, a black mask to conceal his true identity and a turquoise neckerchief. He also wears dark blue rubber gloves, boots, a red T-shirt, and rubber black shorts. Being younger, he is more sane and self-aware than Mermaid Man. However, Barnacle Boy is also more cranky and rude. He often calls Mermaid Man an "old coot." He is revealed to be 68 years old in "Mermaid Man and Barnacle Boy V." As his younger self, instead of a black mask, he wears glasses and is much taller.
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