The Club of Hercules

The only person to have defeat the Kyou sisters a.k.a. Orthrus

[Spoiler] Although he defeated them he didn't without having to fight them, instead he prevented others from fighting until the sisters had taken a bento. [/Spoiler]

[Spoiler] He attempts to do this again in the last episode, but his plans are foiled by Satou. [/Spoiler]