30 days of Avatar - Day 13: Favorite Minor Character (Koh)
Koh the Face Stealer is one of the most ancient and knowledgeable spirits of the Avatar universe. Nearly as old as the Ocean and Moon Spirits, he is the only individual to remember them crossing over to the physical world. He is a malevolent entity residing under an ancient tree in the Spirit World. Possessing the body of a gigantic centipede-like creature, Koh can change the appearance of his face to that of any in his collection at will. Upon seeing anybody or anything express emotion, Koh can steal its face.