Boo is a dark green bat/squirrel hybrid that wears bandages over his eyes. Because of this, it is assumed that he is blind. He lives on the outskirts of Happy Tree Town.
Boo has a really dark personality and will sometimes kill people if he is mentally unstable. But usually this is not his intention, instead he just enjoys scaring people around the town.
- He is the first hybrid in HTF Dimensions.
- He rarely speaks. When he does, he makes screeching sounds, much like a real bat.