Green has a serious, calm, and focused personality in everything he does. Although Red and Green were once bothered by each other because their personalities are so opposite, they ended up resolving their differences.

Green and his Scyther were trained by Chuck of Cianwood City when he was a child. Thus, Green has some cursory knowledge of martial arts, and his Scyther knew Generation II techniques.

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" (Japanese: 育てる者 Trainer).

Green also has a rivalry with Koga of Team Rocket. This began when Green almost killed Koga's Arbok by having his Charmeleoncut it in two, and continued on throughout the series until Koga's reclusion.