Rachnera Arachnera is a member of the Arachne species, a half-human, half-spider hybrid from anime Monster Musume: Everyday Life with Monster Girls
The fluffiest and cutest spider boys of them all, he loves making friends!
You're stuck in his web and that is probably not good for you.
A big ol spider boi that you consider your roommate. Not like he's paying rent or anything, he's just incredibly happy to be around you.