Nihilus would go under deities and monstrosities, as much as people like to claim that he's a Sith through technicalities I don't subscribe to that.
Nox is basically stated in SWTOR:A to be one of the lowest ranking DC members and not very powerful compared to the others.
Hord is tricky because I have a strong feeling that Khem Val is romanticizing his abilities quite a lot.
Nomi was selected to be the 'leader' if you will of the Wall of Light, had a natural affinity with Sever Force, her battle meld and battle med techniques were off the charts, she had great Tutaminis displays and over-all she is a powerhouse with higher LS techniques. She isn't even in her prime yet either, I think she justifies that position.