Tossup between foxes and otters for me. Probably foxes so I wouldn't need a huge water tank!
I think that otters are just the cutest little guys! I have no idea whether they would make good pets but I've always just wanted to be bros with some otters : )
Otters are really cool. I hung out with some otters at a zoo once when I was a kid, we played hide and seek. Feels like a dream to me but my mom has the proof!
Foxes are a great answer, especially for a realistic expectation. We have cats, we have dogs, why the hell don't we have foxes!?