Makoto Shishio

Makoto Shishio is Kenshin's successor when he left his life as a hired assassin all those years ago. Shishio is just as ruthless a killer that Kenshin was, probably even more so. This has resulted in him developing a sadistic taste for killing, all for the pleasure of it. Unable to control him anymore, his government had him assassinated but he survived the attempt but not without a cost. His body was left heavily mutilated, forced to cover himself in bandages, and has a time limit on how long he can exert himself in battle. He eventually crossed swords with Kenshin in an epic battle with our main hero barely edging out to become victorious in the end. He might not be the strongest of them all but his ferocity and ruthlessness are second to none.