This is Ulvan, an old character I used to roleplay with. I just recently redrew him (the art above) because he's actually one of my favorite of my old characters and is pretty fun to draw. (Also because he's one of the only human-like characters that i can draw without thinking it looks horrible)
He usually keeps to himself and looks like he's just always glaring at people. He seems very cold and tends to be aggressive towards others, but in reality, he's very childish and probably wont actually hurt anyone if he doesn't need to. He has another form which he often chooses over his human-like form. In this form, he acts very cat-like and hisses at others if they come too close or he feels like they're threatening him.
Ulvan is a demon prince who went to the human world against his fathers wishes. Often, his siblings show up to try to convince him to go back but he refuses them. He is bound to a human (atm is being changed since I'm no longer in contact with the characters owner) and is basically a servant to this person.
That's basically his summary, haha