Nice to see interest. For the inquisitor I am thinking they will either follow or at least hold some aspects from; Xeno Hybris, Seculos Attendous, Polypsykana, and Xanthism.

For those of you well versed in the lord of 40k and the Inquisition you may have noticed that Xeno Hybris is a proponent of utilizing xenos and their tech and Xanthism is proponent to using the warp to fight the warp. So I will say now that xenos and chaos tainted characters are certainly possibilities. With both of those you will need to be able to hide yourself well enough to function with the group and go where the inquisitor goes for the most part. Basically the first character requirement is being able to pass yourself off as a normal-ish human with like a robe and hood that is good enough. The second is your character wanting to or at least being willing to fight against Chaos and/or for the Imperium.