Keitaro Gentoga

Keitaro Gentoga (幻燈河 螢多朗, Gentōga Keitarō) is a young man with a spiritual constitution, the tutor of Yayoi Hozuki and the childhood friend and boyfriend of Eiko Hozuki.

Etymology

 * Gentouga means "magic lantern, slide projector" (幻燈) (gentou) and "river, stream" (河) (ka/ga).
 * Keitarou means "firefly" (螢) (kei), "many" (多) (ta) and "melodious, clear, bright, serene, cheerful" (朗) (rou).