 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 , Barnacle Boy is still treated in a juvenile fashion, coddled in an infantile way.In his later years, he slightly resembles Squidward Tentacles.He has largely maintained his nondescript slender physique over time.