James, known as Kojirō in Japanese, is a recurring Team Rocket member collaborating with Jessie and Meowth to pursue rare Pokémon—notably Ash Ketchum’s Pikachu. His shoulder-length periwinkle hair frames a single central fringe, complementing green eyes. He typically dons the Team Rocket uniform: a white long-sleeved shirt marked by a bold red ‘R,’ layered over a black short-sleeved undershirt, paired with white pants secured by a purple belt, black boots, and gloves. Alternate attire includes a pale yellow air military jumpsuit and a dark blue formal suit in select missions.

Born into affluence, James fled an arranged marriage to Jessebelle, abandoning his sheltered upbringing to join Team Rocket, where he forged enduring alliances with Jessie and Meowth. Despite his antagonistic role, he exhibits a compassionate streak, nurturing deep bonds with his Grass-type Pokémon—Victreebel, Cacnea, and Carnivine—who reciprocate his loyalty. Though committed to Team Rocket’s objectives, he occasionally allies with Ash and friends to protect Pokémon or thwart greater threats, reflecting his internal ethical conflicts.

In the "Diamond & Pearl" arc, James ventures to Sinnoh to establish a Team Rocket branch, orchestrating schemes like the attempted theft of the Eterna Historical Museum’s Adamant Orb, often foiled by rivals or misfortune. He competes in events such as the PokéRinger competition, facing setbacks with resilience. His past resurfaces when a childhood love letter reignites tensions with Jessebelle, complicating his present endeavors.

Balancing emotional vulnerability with strategic cunning, James frequently employs cross-dressing as a tactical disguise, adding levity to his exploits. His sensitivity and moral introspection contrast his role as a antagonist, highlighting his layered persona—a blend of comedic flair, genuine empathy, and unwavering dedication to his partners, both human and Pokémon.