Yellow Bomber, known as Kiirobon in Japanese media, serves as the team's primary comic relief character. His defining trait is an intense craving for money, visibly exciting him at any mention of financial gain and driving him to pursue numerous part-time jobs. He frequently dreams of wealth and romantic attention, though these aspirations rarely materialize.

Despite his greed, he demonstrates unwavering loyalty to teammates, consistently prioritizing friendship over personal profit during critical moments. He maintains a skeptical outlook compared to more naive comrades like White Bomber, alongside a mischievous streak and high self-regard. He considers himself a skilled comedian and reacts with visible offense when others fail to appreciate his consistently unfunny jokes; a recurring gag involves objects malfunctioning or environments distorting in response to his humor. Only his constant partner, the cheerful horse-like companion Ponycorn (distinguished by sunglasses and a corncob accessory), finds the jokes amusing. Ponycorn enthusiastically joins Yellow Bomber's schemes and shares his flair for dramatic antics. Together, they devise unsuccessful get-rich-quick plans, leading to frustration. To facilitate these or avoid recognition, Yellow Bomber employs various disguises with mixed effectiveness.

He outwardly expresses disdain for Black Bomber's sporadic, dramatic interventions against the Dark B-Da forces, perceiving them as attempts to appear cool. However, this attitude masks underlying jealousy and secret admiration, visualized in scenarios where he imagines Black Bomber acknowledging him during perilous situations.

In combat, he pilots several B-Da Armors. His initial armor, Yellow Shooter, prioritized offensive power above all other first-generation units, utilizing the "Drive Shot" attack. After its destruction, he utilized flight-capable Yellow Crasher, featuring an integrated sound transmission system that amplified his voice into disruptive sound waves during battles and debuting the "Crasher Cannon" attack. He contributed to combined mecha formations: Yellow Crasher formed the left leg of Saint Blaster (merged with White Blows and Blue Braiver), and later integrated into the four-armor combination Saint Dragon alongside Black Devastator, Blue Braiver, and White Blows to confront ultimate threats. His loyalty is repeatedly tested and affirmed through escalating battles against the Dark B-Da forces, despite his comedic flaws and materialistic drives.