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Genthru is a Greed Island player. At first he works together with a big group of players, monopolizing defense spell cards so they can steal people's cards using offense spell cards. Genthru reveals to the group that he is the player killer known as The Bomber, betraying them by using his Nen ability. Genthru has two main attacks: Count Down and Little Flower. He activates Count Down by first touching someone and saying the word "Bomber" in a sentence, and then explaining the ability to them. An invisible bomb is activated, exploding automatically after a certain amount time depending on the victims heartbeat or manually on the command "Release".

The bomb is deactivated when saying "I've caught The Bomber" while touching Genthru. This is prevented by Little Flower, allowing Genthru to explode whatever he grabs in his hands, albeit to a weaker degree than Countdown. When pretending not to be The Bomber, Genthru explains to Gon and Killua that The Bomber is "most likely a Manipulation or Emission type user".