Yonkō

"That's because you're acting like a child. If Hikaru-san or Echo ever said the same to me, I'd punch them out too. That's our relationship, isn't it? If one of us went down the wrong path, the other three would punch him out. That's how it's always been... That's why we'll be able to always stay on the right path. Always, always forward. Whatever space you dug between us is not my problem... That's your problem. No matter how many times you cross the line... I will beat the shit out of you as many times as it takes! You don't get to meet many people like this in life. We're rather lucky... to have made such idiotic friends like them, huh? Raian, if I should ever walk down the wrong path, then it'll be your turn to knock some sense into me."

- Seireitou Kawahiru, after punching Raian Getsueikirite.

The Yonkō (四重鎮, Four Leaders) is the collective name of the four Shinigami Captains among the Gotei 13 whom fought together in the First Shinigami-Arrancar War. They are respectively: the Shiroyasha (白い悪魔, White Demon) Seireitou Kawahiru; the Hitokiri Urufukuro (殺人者黒狼, "Urufukuro the Manslayer"; literally Man-Slayer, Wolf of Darkness), Hikaru Kurosaki; the Aoshime (青死目, "Death of Green Eyes"), Hibiki "Echo" Asakura; and the Karite no Shikyo (刈り手死去, Reaper of Death), Raian Getsueikirite.