Ganma Nishibe leads Team Guts, hailing from Kanzai. Known as "Sniper Gunma" or the "Sniper from the West," his reputation rests on exceptional accuracy and rapid-fire skills in B-Daman battles, showcasing precise shooting and quick reflexes. He approaches battles strategically and intelligently, crafting effective plans and sometimes employing unconventional tactics. Ganma maintains a mature, reasoned perspective, carefully weighing situations. However, the presence of his best friend and longtime rival, Tamago Tosaka, often pushes him to attempt seemingly impossible strategies, influenced by Tamago's unpredictable spirit; Ganma acknowledges Tamago's unique energy, believing "anything can be possible" when Tamago is involved.

Despite his general composure, Ganma possesses a short temper, reacting strongly to perceived disrespect, especially towards Team Guts' reputation or criticisms about lacking power. He also harbors a fear of ghosts. Throughout B-Daman competitions, Ganma utilizes six primary B-Daman figures: Magnet Bomber (his initial model), followed by Wild Wyvern (OS model), Valiant Wyvern (PI-type rapid-fire), Spread Wyvern (PI-EX rapid-fire), and Flash Wyvern (RE rapid-fire), all enhancing his rapid-fire precision style. He maintains an additional collection for research and tactical development. As leader, Ganma guides Team Guts through JBA tournaments, demonstrating commitment to their collective goals. His relationship with Tamago evolves from rivalry into deep mutual trust, significantly influencing his tactical flexibility and competition approach.