Reasonable enough. I might change up his backstory to where the entity inhabiting him actually died, but before it did it granted him its powers and stuff. Its usually supposed to be a lot more vocal and supportive than what I've shown, but since it's barely talked at all in this RP I think having it do so would just seem weird and random. 

Though I could also make it to where the entity becomes silent every now and then because it still needs to recover from the damage it suffered. I think I'll do that instead, how does that sound?