For the monsters prompt!!
Grian is a fae/gremlin and Mumbo is his really stressed, really tired Vampire bf.
"Grian,,, please,,, I am begging you, put that elderich abomination Scar calls a cat down and go to bed. It is 5 AM!" -Mumbo, at least once a week.
Grian doesn't hurt Jellie, he just likes her. And shiny things. The other hermits learned pretty quickly to keep their shinies close, and the knowledge of Grian's loctaion at any given time closer.
Also, every hermit has had a valuable object taken by Grian for the sole purpose of Grian being a lil shit. And Mumbo hears about it. A lot.
People assume Mumbo could return Grian’s spoils, but no. He thinks he stashes them in a pocket dimension or something, because once Grian gets his hands on something, it’s gone for good.