My favorite RPG that I never get to play is BESM: I have a copy of Big Ears, Small Mouse that I’ve played twice. It is a supplement to BESM, but uses animal and insect PCs and NPCs. I was a grasshopper mouse barbarian and my son was a dragonfly rogue, my husband ran it in a Redwall-like world. It was a fun game.
He had problems playing a fun furry character game (where everything was animals or insects). He’s more into Humanoids and Monsters like D&D. He couldn’t wrap his head around cute animal characters.