Gary Oak

Gary Oak is the grandson of Pro. Oak and rival to Ash Ketchum. He resides in Pallet Town in the Kanto region with his sister Daisy Oak. In the manga, he is known as Green in Japan but known as Blue everywhere else whereas Blue is known in Japan whereas known as Green oustide the region. In the early seasons of the anime, he is protrayed as self centered individual with a fan club and a cheer squad but later as the seasons goes on, he loses this and becomes like his grandfather and starts researching pokemon.