What is your favorite enemy and what is your least favorite? Not counting bosses. However, the variants of each enemy are perfectly acceptable. So you could say "My least favorite enemy is a Terror Fiend", but you cannot say "My least favorite enemy is the Mini 'Sassy Child' Slime".
If I had to pick, I would say my favorite enemy is the Slorm. I still can't believe they made this an actual enemy. For my least favorite, I would have to say the Twerkey. I still can't believe they made this an actual enemy. (I also really hate the Terror Fiends but they aren't too bad if you can sacrifice 2 or so Miis and then take them out with good physical attacks in one turn.)