A senior at Hope's Peak High assigned to the Shujin Student Building , but not physically, and is a foster child of the Beauregarde Family Household. A ginormous, immobile boy with a very childlike behavior with a sweet, gentle, and sensitive attitude. Constantly behaves like a toddler who is very attach and has a tendency to cry whenever he's left alone for too long. He is highly gluttonous and is often getting the nutrients shoved down his throat via through a feeding tube and funnel. He also shows a lot of autistic behaviors, and has recently been diagnosed with Asperger Syndrome at the age of 16, the time when Talyson took him home after his parents discarded him for being a hassle in their lives and showing more consideration with his younger biological siblings instead, hurting him deeply. Thus, he felt more joy and happy that his foster family (except for Marquis) shows him greater affection than his biological family, who run on favoritism. Cailleb forges a strong bond with Ijo, granting him the possibility of fusing the Sub Persona, Kumbhakarna. This also gives him the power to fight against bigger and stronger foes.
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