Vetis

-A fallen angel with daddy issues...join the club lmao. Though in his case, his "dad" is Lucifer.
-Isn't a standard fallen angel. Instead, was created in an experiment to make new fallen angels. Not demons; which are borne from humans - but a genuine fallen angel. The experiment was pretty successful, though Vetis is a bit...odd.
-Isn't a morning person and will actually rip you limb from limb if you take his coffee.
-Short boi. Only looks tall next to Zero because Zero is even shorter than normal.
-Hard to see clearly, but his eyes have rings of gold.
-Has a preference for bitter food, and he doesn't really like eating anything overly sweet.
-As a relatively new creation, his personality ended up being heavily influenced by the first person he got attached to...which is how he ended up the way he did. Mystery solved, let's all blame Martis.
-Has a cynical outlook on the world, and mostly does things for his own self-preservation; making few friends and more "associates".
-The only two exceptions being Zero and Martis, though one is dead and the other betrayed his trust and left him for dead. Fun times. He was probably right not to trust anyone.
-Better at healing than causing harm, something that he's a little ashamed of.

-Made out of Raphael's corpse. While Lucifer justifies it by saying that it was a project to see if he can turn the corpses of his enemies into soldiers for his own side, that's a big lie.
-It didn't work of course, with Vetis sharing nothing with Raphael besides his appearance. Not that anyone notices, since with shorter hair and a permanent scowl on the usually sunny Raphael - it already changes his appearance so much.
-Due to him not going out much, even less people see what he looks like.
-Lucifer meets up with him weekly with the excuse that its to "check up on his condition". Luci doesn't seem to know how to interact with him though, so these meetings end up very awkward.
-Raphael's death is definitely the thing that snapped Lucifer out of his "I hate dad" phase. You don't want to know the things Lucifer did to get his hands on Raphael's corpse.
-Not as strong as he should be due to his missing wings. The wings on his back are...actually Martis' old pair, but given new Grace and repaired to the best of Luci's abilities.
-Zero recognized Vetis' resemblance to Raphael, and wanted to use his powers to overthrow Luci and reignite the war with heaven, though his plan didn't work out as intended.