Hank is the son of Frank and Eunice and one of Mavis' friends, that is helping her run the hotel their way. Hank is mostly seen as the lone-monster on the totem pole, as he is picked for being volunteer and the butt in his friend's jokes. As well as being clumsy, isn't very good at scaring other monsters and can remove his body parts like his parents. Like his father, Hank is afraid of fire, possibly from hearing Frank's experiences with it or due to instinct since he wasn't afraid of it when he was turned into human boy. Hank is also seen as the smartest in the group, as he helps Mavis's fix her mistakes, come up with ways to cover up their mess from Aunt Lydia and tries to talk some sense into Mavis plans.
He mentions "my three stomachs" indicating he may have more organs than humans usually do.
He also was able to pull out his own heart, although it quickly seemed to make things difficult for him, so he put it back.
Like his dad he can also survive while decapitated.
Like both his parents, he appears deathly afraid of fire. In Say Princess to the Dress he is terrified of Keith as a fire-breathing dragon, and in Cursery Rhymes he is even scared while inhabiting Lydia's body and Lydia causes his own head (she inhabits his body) to expel flames.
He mentions "I took six years of dirt-tasting" in Baby Got Hunchback
Hank is the only one of four friends who has both parents.