|Anime debut||Yu-Gi-Oh! GX episode 87: "Blinded by the Light, Part 1"|
Gelgo (ゲルゴ, Gerugo) or Gergo, unnamed in the English version, is a Pro League Duelist who participates in the Genex Tournament. Gelgo prides himself in winning many Genex Medallions from Duelists, as shown when he reveals all his spoils pinned to the inside of his coat before challenging Chazz Princeton to a Duel. However, he is ultimately beaten by Chazz’s new "White Knight" Deck. His character is based on Golgo 13.
The only card shown from Gelgo's Deck was "Marshmallon".