o/ Serph here is also an angelic celestial. Though he looks human he's very much not and he makes no secret about the fact that he can transform into a demon. In fact, the whole getting forced to turn into a monster is a song and dance he's very familiar with, so he's good at providing a calm presence for people wigging out over changes.

But I think the part that might be of more interest for Knives is that he's an AI that was (to his knowledge) made to effectively be sacrificed for humanity's growth.

His views of humanity are far more moderate than Vash or Knives' though LOL.

(Just note that this guy carries a constant cannibalism cw, so if that's no good I have an opt out here :>b )