Stray Cat aside, none of these people would pose a particular threat to me. They really have absolutely zero reason to attack me, and Kobayashi is more of a minor inconvenience than anything.
I'd pick stray cat, they literally are just a cat as long as I play with them,give them pets and don't try attacking them I'll be fine he only attacked shinobu because they think she caused its death.
Stray cat is a nice kitty as long as I treat him nice, but if he gets mad I might end up in the hospital from air bullets. Tamami can be a jerk, but a lot of roommates are jerks.