Yushee is the odd version of Yoshi. He is owned by Malleo and Weegee. There are lots of Yushees. They come from a Yushee egg. One Yushee fell into some FFR and became Grushee. He was the third Weegee character to be known. (First being Weegee, then Malleo.)
If he stares at you, you turn into a Yushee. If he licks you, you turn into a Yushee Egg.