Houmei

The Priestess of Seiran's Tower of Rain Water. Centuries ago, she tried to destroy the world. Due to that, she was imprisoned in the forbidden lands of Konron. She later joined the 'Luminous Knights' as their tactician. Despite her appearance, she is actually 3000 years old. In the game, she is actually of the same dragon race as Hyouun although doesn't look like it. An event in the game explains this connection. In the anime, she is referred to as an elf. (Source: Wikipedia)