Yes, it's perfect. It's quite natural to use 'even' the way you have.

I agree with Greg.

"What even are you?" is natural and often-used English wording. Or I might just say "What are you?" (Although - when addressing listeners known to be human, it is extremely impolite to ask, "What are you?" in reference to race, ethnicity or national origin. Ex: "You're not white, you're not black, you're not Jewish, you're not Chinese. What are you?" <= please do not ask human beings this question.) Depending on just how unnerved I was by the non-human, non-ghost, non-vampire, non-zombie that I was speaking to, I might ask something like "What the heck are you?" - although "heck" might not be the word I would use. ;)

No. Don't write it that way. If you want to keep that meaning write: and what should you represent? 🙂🤗