TV-Series
Description
Bull Borgnine possesses three distinct personality states: a calm, naive form distinguished by bluish black hair; a confident, brave form with grayish black hair; and a wild, berserk form featuring spiky red hair, triggered solely during B-DaBattles. This berserk state battles with near invincibility but erases all memory of combat afterward. Physically, he stands 149cm tall, weighs 48kg, and typically wears a yellow poncho holding spare B-Daman parts, complemented by a skull necklace. His B-DaBalls are purple.

In the initial storyline, Bull debuts at Mie's café in his calm state. His personalities activate situationally: the brave form confronts Yamato Delgado but is intercepted by Gray Michael Vincent, while the wild form emerges exclusively with his original B-Daman, Helio Breaker. He enters the IBA Winners Tournament, qualifying offscreen before defeating Terry McScotty in a direct hit battle using a B-DaBall Loader. Later, under Ababa's hypnosis, he fights Yamato in the semifinals but loses after release from control. Bull also tackles the Five Field Challenges, falling to Joe Tetsunosuke at the Phoenix Stage from exhaustion but overcoming Joshua at the Dragon Stage by switching to his calm form mid-match.

A turning point occurs when Bull accidentally damages Cobalt Saber during repairs. After Gray condemns his negligence following Helio Breaker's destruction by the Longhorn Brothers' leader News, Bull immerses himself in B-Daman mechanics. Guided by Armada, he repairs Cobalt Saber and builds Chrome Raven. This cements his role as the group's chief mechanic, crafting upgrades like King Rekuso and King Bakuso while maintaining B-Daman post-battles. Later, Armada appoints him to lead the Neon City Army, supplying the Armada Special B-Daman. Defending Neon City, Marda B's forces petrify Bull and the army until Yamato's victory restores them.

In the sequel series, Bull's personalities merge into a primarily calm state with heightened confidence and reduced lethargy. His appearance shifts: he retains the poncho and skull necklace but rarely uses the hood, replaces maroon overalls with forest green cargo variants, and adds a brown tool belt for mechanical tasks. He obsessively seeks a Strike Shot, winning minor tournaments and battles only to receive non-Strike Shot prizes. After abandoning this quest, he attempts to buy a specialized B-DaBall loader, provoking a shopkeeper and inciting a gang confrontation resolved by Aquilas. He later avoids greeting Yamato due to lacking a Strike Shot but regains resolve to aid allies against threats.