Oh ok. In-universe there are more benevolent werebeasts who lock themselves up or only hunt animals. Sounds like he's basically Chaotic Neutral :P I don't really foresee him being much of an ally. Any of the Supernatural heroes would probably try to slay him on sight haha. 

Yes, Rainmaker is from the area. That sounds reasonable, I bet a certain someone could "persuade" him to surveil villains as well. This reminds me that I should probably make an "Ally Gallery" for me to put all of the NPCs and your character's supporting NPCs as well.