Ichiro Yamada/Relationships

Jiro Yamada
Ichiro adores his brothers, Jiro and Saburo, while Jiro looks up to him, basically treating Ichiro as a god for him. Ichiro acknowledges it and worries that Jiro blindly follows him. Ichiro usually reprimands his brothers for fighting for his attention (or fighting in general), saying that they're family and should act like it.

Ichiro -> Jiro: Younger brother. Thinks he's cute

Jiro -> Ichiro: Older brother. Respects

Saburo Yamada
Ichiro adores his brothers, Jiro and Saburo, while Saburo greatly respects him. Ichiro usually reprimands his brothers for fighting for his attention (or fighting in general), saying that they're family and should act like it.

Ichiro -> Saburo: Youngest brother. Thinks he's cute

Saburo -> Ichiro: Eldest brother. Respects.

Samatoki Aohitsugi
Once good friends, Ichiro and Samatoki turned to be mortal enemies for each other. Ichiro refuses to respect Samatoki, as well as follow the ideals he wants to forces on the world around him. That being said, Ichiro recognizes Samatoki's skills and always says that underestimating him is a deadly mistake.

Years ago, however, after being involved in the turf war in Ikebukuro, Ichiro and Samatoki were best friends. Ichiro used to look up to Samatoki, like to an older brother and was ready to follow him. Although he was usually trying to defuse Samatoki's hotheadedness, Jakurai noted that they can be quite similar in this regard.

Ramuda Amemura
While being in The Dirty Dawg, Ichiro and Ramuda were quite good friends, as Ichiro was taking Ramuda's playful character more lightly than Samatoki. After the disbandment, they still seem to be on good terms, as Ramuda tends to cling to Ichiro when they meet.

Jakurai Jinguji
While being in The Dirty Dawg, Ichiro and Jakurai were good friends, as Ichiro tend to look up to Jakurai as a senior to him. They kept the mutual respect even after the disbandment which didn't stop them from a fight during the incident at the Yokohama container yard. Jakurai noticed that they both share the same stubborn nature and Ichiro admitted that it's true.

Kuko Harai
Ichiro and Kuko used to be best friends, while being together in Naughty Busters, before Kuko picked a fight with Ichiro while being under Ramuda's mindhacking.

Sasara Nurude
While being with Mad Comic Dialogue, Ichiro used to look up to Sasara as his senior. Years later, while searching for Nemu, Ichiro got in contact with Sasara again to find some information but he was unable to help. When Sasara challenged Ichiro for a battle, he provoked Ichiro by insulting his brothers much to Ichiro's fury.

Nemu Aohitsugi
Despite not seeing each other too much, Ichiro and Nemu were on good terms, with him treating Nemu as a good friend. Ichiro was worried when he found Nemu on the missing list and was shocked when he found out that Nemu joined the Party of Words.

Rei Amayado
Not much is known about Ichiro's relationships with his father, Rei. Although, Ichiro was utterly shocked when he saw Rei's name on Nemu's Chuohku profile that Sasara handed to him and according to Rei, Ichiro lied to Jiro and Saburo about his death.

Mozuku Shito
While working as the debt collector for the Stairway to Heaven, Ichiro was quite wary of his boss, Mozuku. Eventually, Mozuku betrayed Ichiro and Kuko, throwing them into the fight with Mad Comic Dialogue to win the turf war, which prompted Ichiro to turn against him. In return, Mozuku kidnapped Jiro and Saburo, threatening the ones Ichiro loves the most.

Gencho Hosen
Gencho was the director of the war orphanage where Yamada brothers used to live. While Jiro and Saburo treated him like their father, Ichiro always hated Gencho, refusing to acknowledge him. Ichiro concerns weren't baseless, as it turned out, Gencho was a sadistic criminal who worked with Mozuku and helped him kidnap Jiro and Saburo.

Tamotsu Ando
Unlike with Gencho, Ichiro was on good terms with the previous orphanage director, Tamotsu. Ichiro even helped Tamotsu to repay his debts with his job, however, he found out that Tamotsu was spending all the money on himself.