Admin Mawile: ヾ(・∀・*) It really varies by pet, as well as what their owner would order them to do.
Shuu: He mostly sleeps and lazes around, unless he’s been told to do something specific. He honestly likes being left alone.
Reiji: He’s more likely to busy himself with chores or trying to find some way of keeping his owner pleased with him.
Ayato: He tends to get in trouble when left alone, often out of some attempt to do something helpful that goes horribly wrong.
Kanato: He’s most likely to curl up in a corner and stare off into space, occasionally talking to himself when he’s sure no one’s around.
Laito: He does whatever he’s ordered to, and tends to spend his alone time thinking of ways to stay on his owner’s good side.
Subaru: He doesn’t dare do anything but patiently wait for his owner to return, and only does more if directly ordered to.
Ruki: He’s good at keeping himself busy with chores and housework, and enjoys the time without someone watching everything he does.
Kou: The only thing he does when by himself is sleep, trying to escape reality, but often falling right into some horrible nightmare.
Yuuma: He’ll do whatever he’s told to while his owner is gone, but tends to be hesitant about chores for fear of messing something up.
Azusa: He’s most likely to wait right by the door, barely able to function without someone around to tell him what to do.
Carla: He needs all the time he can get to rest, thanks to his illness, and won’t do anything but sleep unless ordered to.
Shin: He greatly enjoys the time without a human around, and takes the chance to rest up and relax while you’re gone.