Stephan emerges as a recurring rival from Unova, defined by a charging, confrontational approach to battles. He first clashes with Ash using Blitzle, which evolves into Zebstrika following their initial skirmishes. This Electric-type becomes his steadfast ally, dominating tournaments such as the Club Battle and Vertress Conference—toppling Bianca’s Minccino and Radley’s Braviary before falling to Ash’s Palpitoad in a mutual knockout.

His relentless drive propels him through competitions like the Wishing Bell Festival, where a Litwick-shaped candle covertly aids his triumph—later exposed as an actual Litwick pivotal to his success. At Clubsplosion, he outmaneuvers rivals including Cilan, Bianca, and Montgomery, clinching the title by adapting mid-battle against Throh’s Bind with Bulk Up and Close Combat.

Sawk features prominently on his team, clashing with Iris’s Emolga and Ash’s Scraggy during training bouts. Though deploying Close Combat to disrupt Emolga’s Attract, he falls to Iris in the Club Battle. Later, Sawk aids Ash in honing Scraggy’s Focus Blast, despite disruptions from Bianca’s inquisitive interruptions.

Fiery impatience marks his demeanor, often sparking premature challenges, such as confronting Iris before official matches. His rivalry spills into informal arenas, including eating contests. Frequent name mispronunciations (“Steffen” or “Steven”) irk him, yet he channels frustration into self-improvement, urging rivals to sharpen their skills.

During the Vertress Conference, Liepard’s defeat against Ash’s Krookodile eliminates him, though he observes later matches and joins closing ceremonies with undeterred spirit. A cameo in the Masters Eight Tournament underscores his enduring presence in elite circuits.

Core attributes include an unwavering preference for direct confrontations, tenacious adaptability mid-battle, and persistent name corrections. His arc balances fiery rivalry with mutual respect, prioritizing growth for both himself and his opponents.