Genthru (ゲンスルー, Gensurū) is the former leader of the Bomber group, whose members included Sub and Bara; he was among the players trying to clear the Greed Island game. He was also known as the Bomber among Greed Island players. Genthru serves as the main antagonist of the Greed Island arc.

In the beginning, Genthru shows himself as gentle, friendly and willing to stop the Bomber and finish the game, but after he reveals himself as the real Bomber, he shows his true colors.

Genthru enjoys killing. He is lacking in compassion for people at large, with the exception of his teammates Sub and Bara. This is shown when he volunteers to roll the Risky Dice when one of his companions is readily willing to do it, citing a promise to “share risks equally”. Later, he also agrees to hand an “Angel’s Breath” card over to Gon and company, on the condition that they use a duplicate “Angel’s Breath” to heal Bara.

Due to this, he is extremely self-oriented and is able to commit acts of mass murder bordering on terrorism with no hesitation or difficulty. Genthru also disarms his enemies due to his constant composure—he rarely lapses from his calm demeanor. Genthru is very observant and analytical, showing that, in spite of his blood lust and disregard for consequences, he will not jump into situations recklessly. He takes the time to make up a counter plan when Tsezguerra’s group employs hit-and-run tactics against him and tends to fight strategically, only committing to an action or attack when the risk is at its lowest.