Kess

Kess (ケスー, Kesū) is a professional Hunter hired by Battera to play the game Greed Island.

Greed Island arc
He, Barry and Rodriot have been members of team Tsezguerra for 20 years. At one point, his team has collected 95 types of specified slot cards but during a meeting with the Bomb Devils to exchange cards, some of their important cards are stolen by them. Later, in order to obtain the rare card Strip of Beach, Kess and his teammates team up with Goreinu and Gon's team in a series of matches against Razor and his subordinates.

After winning the rare card, he and his team try to delay the progress of the Bomb Devils so that Gon and Killua have time to recover and train. However, before they can collect all the cards, they learn that Battera has cancelled the prize for clearing the game because of the death of his lover. And so, Kess and his team quit playing the game.

13th Hunter Chairman Election arc
After the death of Chairman Netero, Kess and his teammates are seen at the headquarters of the Hunters Association voting for a new chairman.

Ability
Kess ability is called Silent Worker: "Fly on the Wall" whereby he conjures a device akin to a radar which allows him to track the approximate locations of other people.

Trivia
His pseudonym in Greed Island is Dopple (ドッブル, Dobburu).