Okay, so this is still a mystery to me. Throw some theories at me!
Here is a random list of things about Hunt, which I think are significant, but not sure how all these puzzle pieces fit together...yet.
1. His rare Lightning Power. Bryce can tap into and use his power, ...just like a Carranam in TOG. (I see you SJM.)
2. His true name. Orion in Greek mythology was favored by Artemis...who seems very similar to the goddess Luna in CC mythology (who is favored by the Fae.) Orion is also a constellation. The Asteri have names of stars. Some of their names are either a part of this constellation or very close to it.
3. Rigelus's comment that Hunt has the special ability to "scent demons because of his breeding".
4. Adias a prince of the pit thinks his father would be proud of him. Jesiba knew his father well.
5. Bloodhound doesn't think he smells like an Angel.
6. It's apparently rare/surprising to the characters in CC that a cross-species couple could be true-mates.
7. Bryce's star sometimes glows for Hunt...so, does he have some connection to her starborn power? Or is this similar to Feysand...simply an extension of them being mates and Bryce's star-power glows, when he makes her happy?
......Could Hunt possibly not be an angel...but descended from a winged Fae tribe from Prythian's long-lost Dusk Court? If the Dawn Court winged-fae have white wings, won't it make sense for the Dusk Court winged-fae to have dark wings? Did the Asteri breed this tribe of Fae to be the trackers/hunters of their greatest adversaries - the demons of Hel.