Might come back to this in a bit after his story changes and evolves but here is a pretty current ref of Sillain.

Species is basically like a campy/darker spin on Summoners like in the FF series but a bit more complex and a lot sadder basically? and Gender is a weird one because he's male, but also sort of genderqueer and tends to identify as a girl, even did a few body modifications, but ultimately fell in love with his sort of inbetween body,so yeah? Idek.
He is tiny and cries a lot and basically cannot catch a break anda ll he wants is to find a nice husband or three and settle down and raise a garden and babies and cats.

I also dont think I made his tail fluffy enough but I mean I had to fit the rest of him on the ref so > >