Venus is an fan character for Guilrels Succubus hunt series

This particular Succubus is from a more demonic side of Hell that that she has no recollection of before being found by a fellow Succubus who took care of her. All demons including succubi have a more Hellish form to their usual hot red humans with hooves, wings, and tails, but since they're supposed to be seducing humans they hardly or never go into these kinds of forms. However it isn't too uncommon for a Succubus to be in this kind of form, but Venus has a very special case.

Venus cannot stay human or become more human from her real demon form, when she did tried to go out into the human world as a human, her lack of control made her expand her body into ridiculous proportions such as making her breasts and butt bigger randomly at certain heights of her emotions. Because of this, she hardly desires to turn into a human at all.
due to the fact that she's stuck in her demon form all the time and the fact that she can't handle her random expansions and growths when something surprises her, nor could she ever bring herself to seduce and damn humans like most succubi do she just felt like even more of an outcast to the other Succubi who are mostly proud about seducing humans and damning them. This makes her timid.

Her main form from then on is a short stack Hoppy, although she can make herself taller and give herself all kinds of body shapes, she prefers to be the short stack that you see right now and like the critter she became she's been happier with herself since meeting her boyfriend Ron, an dude with an knack for demonology and paranormal research (who also happens to be into hyper)