Barnacle Boy is depicted as being the undercredited and underappreciated younger sidekick of Mermaid Man.[1] Grumpy and slightly ill-tempered, Barnacle Boy is notable for his brooding, moody disposition and exasperation with his partner's absentminded behavior as a result of old age, and even into his golden years, Barnacle Boy is still treated in a juvenile fashion, coddled in an infantile way.[4] In his later years, he slightly resembles Squidward Tentacles. He has largely maintained his nondescript slender physique over time. In the video game SpongeBob SquarePants: Battle for Bikini Bottom, Barnacle Boy has a son, a daughter-in-law, and four grandchildren which he notes to be his son's "four screaming children".