The Brother is first discovered by the Akudama inside the vault on the Shinkansen, along with his Sister. He is simultaneously revealed to be the voice behind Black Cat.
He reveals himself to be half of the gift meant to be brought to Kantō, and the person behind the million-yen job given to the Akudama. They are to bring him to a secret location called "001003" underneath Expo Park.
Having been raised at the Kyushu Plant, which had a system allowing it to have infinite money, Brother is able thanks to his professor's overwriting of it's restrictions to offer the Akudama unbelievably large sums of money.
The Brother has the appearance of a little boy with black hair and red eyes. He wears a school-like uniform consisting of a black school hat, black and red jacket, black shorts, red stockings and white shoes. On his hat is a metal insignia resembling a coin.
The Brother speaks in a surprisingly bold and fearless manner for a child. Moreover, he is able to hold the Akudama under his thumb.
Despite his outwardly cold nature, as exhibited for example when he reacts with little care to the Brawler's death and subsequently apologizes with the same tone to the upset Hoodlum, and which can likely be attributed to being used to physical abuse, the Brother breaks when faced with his Sister's drive to be reunited with him. He cries when his Sister comes to retrieve him from the vault in Episode 10, despite having spoken calmly to the Executioners just before. Once reunited with his Sister, he exhibits upset at her swearing in a manner more appropriate of a childish older brother.
He is protective of his little sister to the point of being self-sacrificial and refusing her help. On top of his outwardly protective behaviors, the Brother exhibits great intelligence in his ability to come up with efficient schemes to allow for their complicated escape through Expo Park. His notable fearlessness is also exhibited through his ability to talk back to Executioners, for example by claiming to the Execution Division Junior's face that his experience under arrest and their following helicopter ride were fun.
The Brother, being the mastermind behind the complicated job given to the Akudama, shows to have a lot of intellect and a certain degree of natural authority. He also had the ability to control and destroy or regenerate the Black Cat.
In Episode 6, it is revealed the Brother has the ability to regenerate through unknown means which allowed him to survive being impaled by Cutthroat. As such, he is described to be immortal.
Japanese: Maaya Uchida
English: Daisy Guevara
Italian: Annalisa Longo
German: Derya Flechtner
Spanish: Gael Sanchez & Nina Romero
Portuguese (BR): Thayná Cavalcanti
Stage Actors: Ryu Nakamura (double-cast)
Kou Kunii (double-cast)
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