Just in case they offer any inspiration:

My OC Kethakaris (I made a pet of him) in human form is almost like a mix between Milo from Atlantis and Okarun from DanDaDan. 🤔 He’s a slightly disheveled nerdy scholar with round glasses with a chip on one side and tiny little antlers on his head. His hair is typically brown with some moss patches in it, but sometimes it’s just green. He communes with dark spirits and is a shapeshifter. It would be cool to have a little spirit in the picture if that sounds fun. He makes a lot of potions and reads a lot of books if that offers any inspiration too! He’s a vaguely haunted and awkward guy.

He is definitely haunted by a demon that takes the form of a smoky black goat, too, sometimes in a suit. That also might be a fun character to draw. Just some ideas if you feel the spark! I love your art!