Movie
Description
Ichirō Yamada, also known as MC.B.B (MC Big Brother), is a 19-year-old manager of the odd-jobs business Yorozuya Yamada and leader of the Ikebukuro rap group Buster Bros!!!, comprised of his younger brothers Jiro and Saburo. Born July 26th, he stands 185 cm tall with heterochromia—a scarlet red left eye and forest green right eye—and a mole beneath his left eye. His signature look includes a red varsity jacket over a white dual-zipper hoodie, dark blue jeans, red over-ear headphones, rings, and a "B" badge.

Driven by compassion and a strong sense of justice, Ichirō actively opposes bullies and refuses to abandon those in need, displaying fierce protectiveness over his brothers. However, he possesses a volatile temper, particularly when his hobbies like anime, light novels, or Blu-ray collecting are mocked, and he holds deep grudges. His enmity with Yokohama division leader Samatoki Aohitsugi is mutual and intense. Despite his empathy, Ichirō struggles with impulsivity and emotional outbursts, especially towards authority or past betrayals.

His past is marked by hardship. Abandoned with his brothers by their father, Rei Amayado, he grew up in Ikebukuro orphanages. At 14, he began working illegally, falsifying his age for construction jobs to support his siblings and orphanage director Tamotsu Andō. When Tamotsu incurred significant debt, Ichirō joined the gang Stairway to Heaven as a debt collector under Mozuku Shitō. This strained his relationship with Jiro and Saburo, who resented his association with their bully, Samejima. During this time, a violent clash led to mutual respect and the formation of the rap duo Naughty Busters with Kuko Harai. Naughty Busters later allied with the rival group Mad Comic Dialogue (led by Samatoki and Sasara Nurude) to overthrow Mozuku and the corrupt orphanage director Genchō Hōsen, who had kidnapped Jiro, Saburo, and Samatoki’s sister Nemu.

At 17, Ichirō co-founded the rap group The Dirty Dawg with Samatoki, Jakurai Jinguji, and Ramuda Amemura, aiming to unify Japan through rap battles. The group dissolved after an experiment by the ruling Party of Words (Chūōku). Ichirō was forced to battle Samatoki under threat to his brothers' lives; his loss and Samatoki’s perceived callousness shattered their trust. Post-dissolution, Ichirō worked multiple jobs before establishing Yorozuya Yamada. He formed Buster Bros!!! after Jiro and Saburo proved their capability by gathering intelligence, though he initially hesitated due to the dangers of rap battles.

Ichirō’s rap ability, "Critical Blow," delivers attacks exponentially stronger than standard verses. His red Hypnosis Mic, bearing "B.B." insignias, emits sound waves affecting listeners’ sympathetic nerves, amplified by accompanying DJ turntable-like speakers. His lyrics often focus on breaking societal walls and unity, exemplified in songs like "Break the Wall."

Key relationships shape him: unwavering dedication to Jiro and Saburo, whom he raised; a fractured friendship with Kuko, who turned hostile possibly due to brainwashing; deep enmity with Samatoki stemming from The Dirty Dawg's betrayal; and resentment towards his father Rei, whom he declared dead to his brothers. Despite past delinquent notoriety, Ichirō reformed into a community-focused figure, embodying resilience through rap and familial loyalty.