The text says most of what you need to know about him.
For years I tried to think of a good way to present this creature in a workable story. When it first started out I just wanted a living brain connected to the skull of a large undefined monster, and I forced myself to work on a story around the idea. Then it slowly went from an underground monster-fighting ring to a scifi experimentation story, and currently its at the point where its a complete government dictatorship world where a scientist has created a monster as a means to fight back.
The story itself has more dark tones of systematic oppression and dictatorship, but the main chunk that I'm excited to focus on revolves mostly around this creature (he's more of a guilty pleasure for me)