Esteven, a Mexican-American teenager possibly in college as of 2015, was born in San Diego, California sometime in 1996, and then later moved to Vancouver, Canada in 2006, ten years after he was born. By 2011, Esteven is the team captain of the Vancouver Vultures, and he is impressed by Jason Parker's skills after he helps the team win their first game. Esteven later befriends Jason and his best friend Drake Romero.
Esteven was supposed to appear in the main series in a comic titled "Bienvenidos, Esteven Caballero", as a minor antagonist, but would later befriend Patrick McReary. However, this comic was scrapped, and instead Esteven was saved until he was later added into Vancouver Stories.
Esteven actually was mentioned in the main series in the special comic "Straight Outta Green Bay", along with Jason and Drake.