Every year during the month of October is when Nexas takes control of Ren morphing his body into his cursed shape. Nexas is a ghost that lives in Ren and can only take control of him during the month of October through January. He is most powerful during the month of October and has quite the appetite. when he first awakens he has a large hunger for sweets and will search for candy until he's full. the Face on his stomach can look around, and express emotion (mostly just happy and mad). Once he has his fill of candy his emotion will change from grouchy and rude to decently happy and calm. Nexas can only control Ren at night so during that time he's hunting for candy a bit like a werewolf, and do to the amount of sugar and energy Nexas uses during the day Ren is usually in his room trying to sleep with an aching stomach. And Yes Nexas can leave Rens body but he doesn't like not being able to touch things or in general being a ghost.

let me explain this a while back ago I posted a pic that showed one of my oc's Ren possessed by a spirit that lives in him (I deleted the pic I didn't like it). I didn't like the way it was in the beginning and wanted to expand on the idea so here it is.

Hope you like (I guess)