Tatsuya

Tatsuya is a founder of Mugen and the best friend of Kohaku. He is also the one who created the ITOKAN diner that served as the hangout place of Mugen and currently the base of Sannoh Hoodlum Squad.

History
Tatsuya's dad used to ran a restaurant. He and Kohaku always used to eat omurice there when they were kids. However, the restaurant closed down due to renovation and after a while his dad passed away. He grew up taking care of her younger sister, Naomi.

He met Kohaku when he saved him from bullies when they were children. Tatsuya offered his hand to Kohaku who was isolated in school. The two eventually became close friends and grew up with a passion of bikes. Furthermore, they always get engaged with fights. One of their fights led to Kohaku injuring his left eye.

He started Mugen with Kohaku with the intention of "running forever". As they grow more mature, Tatsuya lessened his gang activities to focus more on business. Following his father's footsteps, he opened a diner called Itokan.

Tatsuya stopped participating in the gang's activities after opening the diner but often gave advices to them, such as warning them about not taking on the Amamiya Brothers again. When the gang was uncontrollable, Tatsuya is constantly worried and often asks Kohaku to change.

After sometime, Tatsuya gave Tsukumo the key of Kohaku's bike, that he sold to pay for Tsukumo's hospital bills, and told him to give it to Kohaku after he returns to his old self. Kohaku finally decided to give up Mugen. However, just as he was about to tell Tatsuya, a car was going to run them down and Tatsuya pushed Kohaku away to save him. This led to Tatsuya's death, Tsukumo being in a coma, Mugen's disbandment, and Kohaku falling into despair.

Personality
Tatsuya is an extremely kind and friendly person. He is a diehard fan of bikes, he became friends with Ohta and Konishi due to their interest on bikes even though they were about to fight a few seconds earlier. He was constantly involved in fights when he was a teenager, but started to avoid it when grew more matured. Tatsuya is a wise person and often gives advices to his friends, especially Kohaku. He preferred to talk over the problem regarding the Hyuga-kai than fighting them forcefully. He was worried about Kohaku when Mugen was uncontrollable and tells him to not be afraid of change.

Appearance
Tatsuya is almost as tall as Kohaku. He used to wear leather or vest jackets during his time with Mugen, but eventually started to wear more formally after leaving the gang.

Fighting Prowess
Tatsuya was a prominent fighter during his time with Mugen. He has equal strength and fighting ability to Kohaku when they were younger but Kohaku was getting more stronger due to him fighting constantly while Tatsuya is losing his touch over time after he stopped fighting.