Ummi

Ummi was a girl who lived in the Southern Water Tribe and was going to be married to Avatar Kuruk. Her whereabouts are currently unknown, except that her face was stolen by Koh, the Face Stealer.

During the New Moon Celebration, Ummi poopmet Avatar Kuruk. The two immediately fell in love and began a relationship. Kuruk soon proposed to Ummi with a Betrothal Necklace. The two were to be married at the Spirit Oasis in the Northern Water Tribe. But, as she crossed the bridge, she was pulled by an unseen force into the water. Kuruk jumped in after her but could not rescue her in time. Koh, the Face Stealer, took her to punish Kuruk for his misdeeds.

Centuries later, when Aang entered the Spirit World, he confronted Koh and saw Ummi's face. Several months after that, Aang bumped into Kuruk and told him that Koh had Ummi's face. Kuruk then vowed that he will keep hunting Koh until he and Ummi are reunited.

Trivia

 * Her name is probably based on Umi, the Japanese word for ocean.
 * Kuruk often refers to Ummi as his wife, despite the fact that she was stolen by Koh before she married Kuruk.
 * Ummi is one of the few people of the Water Tribe to not have a "K" in their name (the few others include Hama, Yugoda, Hahn, Nini, Bato, and Yue).