Kichiro (IC) and Rain run a dragon café together, it is basically a cat café but with small dragons instead of cats. It's... probably a bit more chaotic than most cat cafés. There's around 4 or 5 different dragons there (I haven't figured out all of their names yet... The café itself is named Donuts & Dragons)
Taro has some pet rats
Torio has a bunch of "plants" in their home that might as well be pets because it's a bit vague whether they're actually plants or animals (they're made of flesh and bones and blood and stuff like that and probably need to be fed, but look similar to plants)