Thanks for all the ideas guys. A lot of really nice ones!
Prime, what sort of "Government" will these guys be working for? Who/What is in charge of it? That will help whittle down the possibilities into something more specifically fitting
It's going to essentially be a Supernatural government. In a way the mythological boundries are being taken down, so beings from norse, greek, japanese etc, etc. will be banning together. As to who is the "Big Guy In Charge," that is still somewhat up in the air. I'm considering having Zeus, Odin, the big guys of their respective mythos be "Governors" of their areas, and create the big guy myself. That's up in the air.
Are you looking for what kind of magical creature your main characters are going to be, or just background characters, like a magical SWAT team who back up the lead detectives?
It's more appropriate to think of the land as a prison, the main and supporting characters would be prisoners and slaves. The creatures I'm looking for would be the guards keeping the "Peace". (But it's not as black and white as that - The slaves and prisoners are the good guys)