Eta

Eta is one of the Game Masters and creators of Greed Island. She is Elena's twin sister, one of the other creators of the game. Eta is in charge of the reception of incoming players, her main role being to explain the basic rules of the game. She monitors everyone that comes to the island, from players to intruders. Eta has shown to be very professional and acts almost machine-like when detailing the rules of Greed Island. Eta's Nen ability is unknown, but she is able to conjure swords and turn them to cards while explaining the game's mechanics. Whether this is her ability or not has yet to be revealed. She was able to detect the Phantom Troupe when they tried to enter Greed Island by boat, but due to the vastness of the island, it is highly unlikely that she used En.