AB does accept others like demons and angels, as long as they properly fit into the show's type of monsters really well. I know AB's OC is part human part demon, so she accepts that sort of thing. It'd be quite good to have characters other than hunters, as when this RP first was going for 2 years, we were overloaded with hunters, to the point we couldn't properly keep up with everyone posting and staying with team free will, and still stay canon to season 5. 

Hope that makes sense! XD! So basically yes, as long as it's not too eccentric. Stay faithful to the show and I'm sure AB won't have a problem! ^_^!