Kozufuturo is part of Gensuru's initial gang, working together to complete Greed Island. It can be assumed he is also hired by Battera. He sits in a forest all day, so people can use him as a checkpoint and reach him with Magnetic Force, getting closer to their main base.
Abengane is one of the hunters hired by Battera to try and complete the game. His power becomes clear after he has a bomb placed on him by Bomber: He can remove Nen curses placed by other. This means that he is the Jyounen user the Genei Ryodan is looking for. He is eventually hired by Hisoka to remove Kuroro's curse.
He is Gon's father and a legendary hunter that have made many contributions to the world. He is considered one of the 5 strongest men in the world. He created the game "GREED Island" with the help of his comrades. With this, his son Gon has given a hint to find him in the game and finish it. His fighting skills and abilities are still a mystery. He knows a lot about the secret of the world beyond this world called the Dark Continent. Ging possess great leadership skills and the ability to manipulate the situation to his own use.
Tsezguerra is an experienced Money Hunter and 1-Star Hunter. He is hired by Battera to beat Greed Island and also tests the people who want to enter Greed Island in order to earn the 50 Billion prize money. He and his team ally with Gon, Killua, Biscuit, Hisoka and Goreinu to take part in the dodgeball game against Razor. He and his team later engage Genthru's in a game of chase in order to buy time for Gon to train against Genthru's "Little Flower" ability and for Killua to heal his injuries.
Bisuke is a 57-year-old woman who looks like a 12-year-old girl, and is a master and experienced teacher of Nen. She continues the Nen training Wing gave to Gon and Killua during the Celestial Tower arc. As a Treasure Hunter, Biscuit loves collecting rare jewels (and gets very excited about them; she has a habit of naming them) and getting money. Biscuit has a devious personality. She initially uses her cutesy appearance and demeanor to her advantage whether it's for information gathering, getting what she wants, or even in combat by acting innocent and helpless so most people will usually put their guards down around her. However, as a teacher of Nen, she has a stern and serious attitude towards her students. Though in the beginning she was out to destroy Gon and Killua's friendship, at the end of Greed Island she acknowledges (albeit, in her head) that she's close to developing parental feelings toward the two of them. (Source: Wikia)
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 is the player killer know as "Bomber". He betrays his group by using his Nen ability. Genthru has two main attacks: Count Down and Little Flower. He activates Count Down by touching someone and saying the word "Bomber" in a sentence. An invisible bomb is activated, exploding on the command "Release". The bomb is deactivated when saying "I've caught Bomber" while touching Genthru. This is prevented by Little Flower, allowing Genthru to explode whatever he touches. Explaining his Count Down ability to his target is required for it to work. When pretending not to be Bomber, Genthru explains to Gon and Killua that Bomber is "most likely a Manipulation or Emission type user".
Puhat is in the same exam as Killua, Bisuke and Gon and gets hired along with them and others. Unlike Killua, Bisuke and Gon he and Abengane accept Gensuru's offer into an alliance.