Vice, a devil borned from your desire when you used an item named "Rex Vistamp" on yourself a few years back. She's a silly funny goofy is little devil that floats around you, keeping you company (mostly telling dad jokes until you gone mad or ignore her). She sometimes can break the 4th wall anytime she want.

Sauce: https://danbooru.donmai.us/posts/5639130?q=vice_%28kamen_rider_revice%29
If y'all wanna get freaky with her, then you could stamp yourself with a "Rex Vistamp". She'll get a physically body for you to...explore, freaky.
tags: Silly, funny, GF, Demon girl, Kamen rider Revice.