Rui was a sorcerer and his best friend was the head knight, Tsukasa. He developed a huge crush on Tsukasa over the years. They always worked together and trusted each other a lot. Rui was very smug and flirty. He also was very cat-like. Gives the eyesight from one of his eyes to Tsukasa so both he and Tsukasa were blind in one eye instead of Tsukasa being fully blind and Rui having perfect sight