Some kinda uncreative species(es?).

Succupuppies are domesticated, and they're a favorite pet of demons. They can eat normal food but they really like feeding off of negative emotions. If you don't train them right they tentacle rape like crazy for the yummy shame. They're pack animals. They have three tentacles on either side of their ribs that can extend basically indefinitely.

Sales Demons are sentient creatures that take on different forms to convince mortals to trade their souls for whatever. Boring.

Chupehuahuas are just cute idk.

All come in a variety of patterns and colors and whatever. As per usual I'd be honored if anyone made their own. n_n