Chase is a young boy with both black hair and eyes, he wears a red and white baseball cap with a red Poké Ball logo on it. He also wears a red and white jacket with a black undershirt, blue shorts, and black and yellow sneakers with blue shoe laces. He carries a black and white backpack.
He is very quiet as most Pokémon protagonists almost never speaks and is the outlet of the player whatever they want him to be.
At the start of the games, Chase wakes up in the middle of his room in Pallet Town, apparently after just having a vision. When he tries to go downstairs, his friend Trace suddenly barges into his room and questions him about the weird look on his face. To cheer Chase up, Trace talks about how Professor Oak, the authority on Pokémon in the Kanto region, apparently wants to give the both of them a Pokémon of their own. After briefly talking about Chase's computer, Trace then runs off towards Professor Oak's lab.
When Chase leaves his house and reaches the outskirts of Pallet Town, he is shocked to see Professor Oak being surrounded by Pidgey. However, the Pidgey soon fly off without hurting anyone, after which Professor Oak greets Chase. Professor Oak talks about how he promised to give Chase a Pokémon that day, but he gets confused when he apparently forgets where he put it. However, opportunity knocks when a strange Eevee or Pikachu shows up at that very moment. Even though he has no Pokémon of his own and is unable to battle it, Chase is able to capture the Pokémon with Oak's help. After being complimented on his fine performance for a first-timer, Chase takes Oak's suggestion to nickname his Pokémon and tries to pick up its Poké Ball. Much to the duo's surprise, the Pokémon (which is still inside its Poké Ball at that very moment) bounces around Chase for a few moments before it suddenly zooms off towards Oak's lab.
Chasing after the Pokémon, Chase and Professor Oak meet up with Trace when they enter the lab. Surprised, Trace talks about how there was only two Pokémon in the lab moments ago before Oak reveals that Chase is the owner of the wild Poké Ball that came zooming in. When an incredulous Trace says that he has never seen it happen before, the Pokémon briefly bounces in its Poké Ball. Oak then tells Chase to take the Poké Ball, and when he does, the Pokémon bursts out on its own and happily greets him. Trace then takes a Pokémon himself, and before Chase leaves the lab, Professor Oak gives him a Pokédex, subsequently telling the boy about his dream to make a complete guide on every Pokémon in the world.
After being challenged to a battle by Trace and subsequently leaving the lab, Chase journeys across the entire Kanto region on a long quest. He destroys the evil Team Rocket, defeats all of the region's Gym Leaders, and eventually becomes the Champion by defeating Trace himself. Along the way, he also defeats Red, Blue, and Green, conquers every Master Trainer, and completes Oak's life-long dream by collecting every single Pokémon in the region.