So a while back I bought this character https://www.weasyl.com/~tylgamation.....nthproto-adopt and then  duskofreocersilly drew them one day and I decided to just give it to them in exchange for following some looser design principles to design me some new characters. She's an alchemist. No those bubbles on her belly is just a tattoo.

Oh yea, depressing lore below. I'd spoiler it if I could so just uh, look away youngins!

So they're not what they seem on a surface level.
Them being able to brew stuff in their own belly is a side affect of an event long long passed.
When a loved one of theirs - like actual soulmates, the other one was a necromancer, though used it to heal the dead and handle spirits to help them move on with their life. Said loved one, is dead. Has been dead for 120 years. You may ask, why is this fella still around?

Well uh, during the process of trying to bring them back to life, a lich spell was discovered. Said transformation spell was professionally fucked up by our fella here, and their SO got turned into an amalgamation of spirits and flesh, while the character here became a lich in their own right. While not needing to necessarily kill or consume anyone, they've learnt to siphon the soul/life essence of people nearby them. Slow enough to not really have an affect on someone else's life, like something you could do to shorten your own life amount of years.

This, still, however, does not make them happy. They've been unable to sleep despite being tired all the time, but fortunately by now they know how to handle their hunger/tell how much they need to consume.