Sadakuni, Ikki

Sadakuni Ikki was an international terrorist. He earned a Kakerou membership by defeating five members, two of whom had their lives taken as compensation.

[Spoiler] His exclusive Referee was Mekama Kirou. The reason for all these gambles was to make enough money to pay for a rocket launcher and more artillery to start a revolution by destroying Tokyo's stock exchange district. [/Spoiler]

(Source: Usogui Wiki)