Green Oak is the second main character of the manga series Pokémon Adventures. He is the grandson of Professor Oak. His first Pokémon was a Scyther -- he is shown with one when he was a child. When he was young, he trained in Johto under Chuck, the Gym Leader of Cianwood City. Green's special skill, as described by Professor Oak, is Pokémon training -- that is, leveling them up and making them strong, and as such is referred to as the "Trainer".
Green has a serious, calm, and focused personality in everything he does. Although Red and Blue were once bothered by each other because their personalities are so opposite, they ended up resolving their differences.
Green had already been waiting inside of the lab for ten minutes. He rolled his eyes and leaned back against the table, his fingers curled around the edge. How long would it take those other two to get here? Grandpa wasn’t here quite yet either. Now where could he be?
The boy lifted a hand to run slender digits through his hair as he idly glanced around the musty, old room. It had been years, but it felt like only days since he’d first started his adventure in this place. Green pushed himself from the table, arms now folded across his chest, as he took well placed steps to survey the area. He could feel a smile forming on his lips.