OH MY GOD IM SO SORRY MAN!! SORRY THIS TOOK SO LONG TO REPLY TO!! 😭😭

katherine and jules - technically wouldnt have a pet but there was a stray cat (tabby) that wouldve been fond of them and their garden yk but i think post prevhevil in the best ending for katherine she'd have a russian blue because.... Because 🤭

tsukiko(oldsona+catherine oc) - probably not but at most she'd have some bettas those kinda fish

loes - i believe she would for 2 reasons 1 she has pet allergy 2 We've seen a detective wages in that series she wouldnt risk that shite with a pet lol

cereza - its i think aglaya would have a black cat than her having a pet herself

moira - maybe pre the town, a border collie maybe but it died b4 she met yulia

ariadna - nope shes generally a rather apathetic person and i would say that extends to caring for another being unconditional love or not