Tsuyoshi Wappa specializes in Loop-the-Loop yo-yo techniques. He first appears as an opponent to Shunichi Domoto in the Japan Champion Carnival tournament. As an experienced competitor, his skills earn respect through a pivotal match against Shunichi, marking a significant moment of recognition for Shunichi among seasoned players.

After defeat in the tournament, he shifts into a recurring supporting role later in the series. His interactions feature playful hints from Mai Kirisaki suggesting potential romantic interest or amusement, though the nature of their relationship remains ambiguous.

Available sources provide no substantial background details like family history or personal origins. His development centers on the shift from rival to ally within the main group.