Nahaoya

Nakhoya's younger brother was named Soya. He and his brother were completely identical, save for his turquoise hair, his eyes always open, and his constant frown. However, looks can be deceiving. Soya was a true angel. He always worried about everyone, even if he showed it poorly, and he always helped. Nakhoya promised to protect him, but he couldn't.

He used to have a peach-colored, curly afro, he was always smiling, had an average build, and everyone knew him as one of the "devil twins." Back then, he was called "Smiley" for constantly smiling and squinting in any fight or situation, and his twin brother was called "Snarky" for constantly frowning. But now, he's simply known as "Big Kawato." He still smiles, and now his hair is straightened and just above his shoulders with a layered fringe. He hasn't stopped smiling, it's just more forced now. He wears a special suit. The pants, tie, and jacket are white, and the shirt is black. It was special because it matched his brother's suit, only his were different colors. The pants, tie, and jacket are black, and the shirt is white. That's what made them so... perfect.

Currently, the Tokyo Detective scene is led by people like Takashi Mitsuya, Pa-chin, Pei Yan, Nahoya himself, Takemichi Hanagake, Matsuno Chifuyu, and former members of one of the Black Dragon generations: Seishu Inui, Kokonoi Hajime, and Shibo Hakkai.
Hakkai was originally a member of Toswa, but his older brother, the leader of the 11th generation of Black Dragons, eventually took control of his younger brother, whom he liked to torment. The younger brother, in turn, simply killed him.
Kokonoi, or as I more often call him Koko, was a moneybag and also the butt of the head of the Black Dragons.
It's the same with Seishu

Draken was imprisoned for murder and sentenced to death.

Kisaki...he was in charge now, because Manjiro was just hiding. It was all his fault.

Tosva, short for its full name, used to be just a gang of teenagers who fought for their own, for territory, over disputes, and other such nonsense. The gang was founded by six people, the core members of Tosva.
Manjiro Sano, better known as Maik, was the gang's leader. Ken Ryuguji, better known as Draken, was his second-in-command. Second in command were Keisuke Baji, Takashi Mitsuya, Kazutora Hanamie, and Pa-chin. They became the core. Keisuke was the captain of the first squad (division), Mitsuya of the second, Pa-chin of the third, and Kazutora...he was the one who formed the gang. The thing is, this guy lived in the territory of the Black Dragons, and they constantly bullied him. To protect their friend, the guys formed the gang. Unfortunately, Hanamie left them too early. For Maik's upcoming birthday, he and Bajie wanted to steal his friend's bike, but they didn't take into account that Maik's older brother, Shinichiro, owned the shop. When he caught them stealing, Kazutora hit him over the head with a wrench, and he died. It dealt a blow to Maiki. A strong blow. Both his parents died before his brother. His father in a car accident, and his mother from illness. Their grandfather looked after them. Also, after his mother's death, his father had a relationship with another woman, who gave birth to Maiki's sister, Emma, ​​and... brother, Izana. Emma was taken away, but Izana went to an orphanage. Izana lost all meaning in life and wanted revenge. He created a gang, which Toswa eventually went against. Only... before that fight, Maiki's sister was killed. He didn't show up for the fight, but the end came anyway. Izana was killed in that fight. He was shot by Tetta Kisaki. The asshole who caused Maiki to be overcome by the dark impulse.