I've been wanting a pet Fancy Rat for the longest time, but they're illegal where I live. I've had a couple before, and I fell for them pretty hard. The does are really social, and very intelligent for a pet. You can train them and play with them like you could with a larger animal. Probably the only rodent pet I'd ever consider. Sadly, all the things that make them amazing pets makes them horrible pests, so they're not allowed everywhere.
I've had a thing for Fish in the past, but I generally view them as a interactive ornament for the most part. Honestly, I prefer maintaining the tanks to caring for the fish, but they do make it all look much nicer.
If a dogs trained well, I get along really well with them, but dogs tend to dislike me. Poorly trained dogs tend to irritate me a bit, but I can see why people love them so much despite a lack of training. They can be amazing companions. Cats are cats. I've had many, and they just kind of do their own thing.