Umi Ryuzaki is a fictional character from the anime and manga series Magic Knight Rayearth, created by CLAMP. She is one of the three main protagonists, known for her strong-willed personality and exceptional swordsmanship. Umi has the ability to control water, which she uses in battles to protect her friends and fulfill her quest. In the story, Umi is summoned to the magical world of Cephiro alongside her companions, Hikaru Shidou and Fuu Hououji. Together, they must rescue Princess Emeraude and confront various challenges. Umi's character development throughout the series highlights themes of friendship, bravery, and self-discovery.