Kaigaku was the former disciple of the Thunder Breathing Hashira - Jigoro Kuwajima along with Zenitsu. A talented former ...

However, Koro Sensei from Assassination Classroom has ... he trained Tanjiro in his Water Breathing technique so he could join the Demon Slayer Corps and get vengeance for his family.

Many fans consider Yoriichi to be the best of the best in Demon Slayer, but is there anyone in the series who surpassed him?