Kai Midorikawa

Kai Midorikawa (緑川 開), nicknamed Green, is a character from the Pokémon Pocket Monsters manga, and is based on Blue from the original games. He is Red's rival and takes Pokémon much more seriously, although has questionable ethics in attaining his goals. His surname contains the Japanese word for "green" (緑 midori). Source: Bulbapedia