Kouran Mori, the Big Bad of the series is a hideous millionaire who believes he can do whatever he likes thanks to his wealth and desires invincibility and immortality to enjoy his wealth forever. To that end, Mori abuses his adopted son, Kurei, having killed Kurei's lover Kurenai, and blackmails him into service with a bomb inside Mori's own wife: Kurei's loving adoptive mother. Mori runs brutal underground fighting rings that routinely result in horrible deaths, and manipulates fighters into Training from Hell where their loved ones die while he employs multiple psychotic murderers and uses them to kill innocents. After Kurei loses the tournament, Mori reveals he created an Opposite-Sex Clone named Renge and attempts to detonate the bomb in his own wife, gleefully declaring he will destroy whatever Kurei loves. After achieving immortality, Mori becomes a Humanoid Abomination whose desires for food and sex have 'merged, ' which he satisfies by raping and eating innocent women. He sexually abuses Renge and ends up devouring her to steal her soul and power as she begs for his mercy. In the end, Mori is a wholly irredeemable beast of a man who lives for nothing save his own whims and pleasure.
Mokuren is an Axe CrazySerial Killer who loves to target women with nothing less than a Slasher Smile and cheerful glee. With his power over plants, Mokuren invents new ways to kill his victims: impalement with branches, creating carnivorous plants to devour them or horrible torture. Mokuren convinces his former kid sidekick to let down his guard before trying to devour him with a plant as well. Gradually gaining a seething hatred for Recca after Recca defeats him, Mokuren sinks further into depravity and evil. While he develops a relationship with fellow evil teammate Mikoto...only to betray and murder her the moment she's inconvenient to him, coldly saying he never loved her and defeating Recca is all he cares about. Even after his death, the narrator discusses what a monster without honor, morality or humanity he was.