Eijirou Sharaku

Eijirou Sharaku (Sharaku Eijiro) is a martial arts teacher of Mairu and Kururi along side his younger sister, Mikage. He also has an older brother, Eiichirou. Eijirou and his siblings teach at Rakuei Gym which is hosted by their father, Eiji Sharaku, and are introduced in Volume 08 of the Light Novels.

Adabashi Arc
Eijirou and his siblings are introduced in this arc. They don't appear to play any significant role until near the end. More to be added.

Dragon Zombie Arc
Eijirou and Izaya fight outside the dojo until Mikage overhears them and puts a stop to it. Mikage berates and severely beats Eijirou for disgracing the name of their gym by starting a fight in public (as well as proclaiming she was raped to everyone within a three block radius). Mikage lets Izaya escape and is about to leave before Eijirou stops her again. He asks if she was still interested in Izaya after all that he's done and she simply knocks him out in response.

Mikage Sharaku
Main Article: Mikage Sharaku

Izaya Orihara
Main Article: Izaya Orihara

Mairu and Kururi Orihara
Main Article: Mairu Orihara, Kururi Orihara