Izana Kurokawa/Relationships

Shinichiro Sano
Shinichiro was the first family Izana had after being orphaned and loved him dearly. He exploded at him when he found out they weren't actually real brothers; which lead to him feeling extremely lonely again. He later took over Shin's gang.

Manjiro Sano
Izana was jealous of Mikey of how Shin gave him affection also, wanting to be the sole brother to Shin when he found out that he was not related to Shin his jealousy strengthened. Ultimately wanting to destroy Mikey.

Emma Sano
Emma and Izana lived together until Izana was brought to the orphanage, promising they'll be together again. In his last moments, he said Emma's name as hints of his regret about what he did and still loves her as his sister.

Seishu Inui
Izana and Inupi met when they were kids at Shinichiro's bike shop. Inupi served under Izana as his right-hand man during the eighth generation of the Black Dragons. Inupi later disliked Izana for the way he changed the gang Shin worked hard for.

Kakucho
Izana and Kakucho met at the orphanage. Kakucho was fashioning a makeshift grave for his parents when Izana approached him, complimenting his scar and asking what he was doing. When Kakucho tells Izana to leave him alone because he will be bullied too if he is seen with him, Izana destroys the makeshift grave. He tells Kakucho to forget about the dead and live as his servant which Kakucho agrees to.

The boys grew up like siblings with their shared dream to create a kingdom for those who have no relatives, a kingdom which they would call Tenjiku. Tenjiku later became Izana’s own gang with Kakucho being his strongest man. According to Ran, Kakucho wasn’t a delinquent until Izana ordered him to join Tenjiku.

Though generally a moral person who initially questions Izana's methods, Kakucho obeyed Izana’s every order because of his undying loyalty to him, going as far as to shoot Takemichi upon Izana’s command.

When Kisaki began firing at Kakucho during the fight between Toman and Tenjiku, Izana's body moved on autopilot jumping in front and ultimately killing him. In his dying moments, he smiled telling Kakucho that he was the only one he had, making Kakucho cry and remembering their childhood. When Izana took his last breath, Kakucho shifted towards Izana and grabbed his hand as the blood from their wounds mingled on the ground. Kakucho hoped he would die along Izana so that the latter didn't need to be alone in the afterlife. Having fought to seek a utopia, Kakucho and Izana held hands until the end of their dreams, connected beyond blood though their shared fates. In the end, Kakucho survived.

In his last moments, Izana realized that he was never alone. He came to see Kakucho, who was always by his side, as family. After his release from the hospital, Kakucho created a makeshift grave for Izana like he had done with his parents, wishing him to rest well.

Ran Haitani
After Izana dies and Kakucho passes out, Ran is the one who sends Izana off respectfully. He admired Izana and Kakucho's way of living. This must have been due to the fact that Ran and his younger brother Rindo had survived in the delinquent world together themselves.