Tee-hee is a ghastly green ghost with facial features resembling those of a Grublin. This enemy is found just about everywhere in Mad Monster Mansion, hovering around and chasing after intruders, giggling all the way. Don't try attacking this monster unless you've got a supply of Golden Feathers with you, since the only thing that can take this baddie down is the Wonderwing ability.
During the minigame with Tumblar inside the shack, a purple Tee-hee patrols the game board in a counter-clockwise circle. Although it can be defeated using the Wonderwing, it respawns immediately and will only yield a honeycomb the first time it is killed, so it's best just to avoid it.
Tee-hee bears a remarkable resemblance to the Green Spooko, a ghostly enemy found in Banjo-Kazooie:Grunty's Revenge. They also resemble the Twinkly Muncher's from Freezeezy Peak.
The purple Tee-hee in Tumblar's shack.