Rui Usui

Rui Usui (碓氷流生 Usui Rui) is the main protagonist in the one-shot chapter Yukiochimura ni Ojou-sama!. He is the younger brother of Sara Usui the another main protagonist of the mentioned one-shot.

Trivia

 * Name Meaning
 * Usui (碓氷), meaning light.
 * Rui (流生), meaning flowing life (Japanese).