After giving a long thought, probably guy with tits and also vagina. Or guy with dick and boobs but who prefer to take it in the butt. Here’s my reasoning: I pointed out in an earlier comment that a male succubus would be called an incubus, but that’s not necessarily true. Incubi and succubi may have been invented as explicative myths for wet dreams. They’re demons that have sex with people in their sleep. “Succubus” means “which slips under”, referring to it’s ability to have sex with a man sleeping on his stomach. “Incubus” means “which slips inside”, referring more directly to the nature of the sexual act. Therefore, there could be a male succubus if it’s a male demon that “slips under” the victim to have sex, in other words, a demonic bottom. Penis is optional in this case, all that determines whether or succubus is male or female is how they identify, so face-down succubus with penis works as well as succubus with vagina (whichever orientation). Boobs are also optional. They seem implied by the image, but succubus Garfield could also just be wearing a bib.