Umi Ryuuzaki is one of the main protagonists in the anime series 'Magic Knight Rayearth.' She is a high school student who is transported to the magical world of Cephiro along with her friends Hikaru and Fuu. Umi is known for her strong-willed personality and her exceptional skills in swordsmanship. As the Magic Knight of Water, she wields powerful magic and her weapon, the Water Sword, to protect her friends and fulfill her mission to save Princess Emeraude. Her journey is marked by personal growth, bravery, and unwavering loyalty.