Girom, or Gillom in the game, is a psychotic boy about Ginta's age who enjoys killing, particularly women, much like his maniac older sister, the Knight Rapunzel. This is largely due, however, to the tremendous stress from their childhood abuse from their mother, whom they later killed. He was present at Phantom's revival, along with the Knights and several other Chess Pieces. He and Orco attacked Vestry during the Chess Piece's war campaign, under the order to search for a certain ÄRM. While searching the boat at the cave's end, he quickly meets up with and fights Ginta, who defeats him using Gargoyle.

Girom was seen with Rapunzel observing the fight between Ginta and Garon. Girom then showed up in the 4th Round of the War Games, where he killed Aqua after her tie with Nanashi. As he wanted, Girom had a rematch with Ginta, and Girom almost won, due to Ginta's anger of him killing Aqua. Babbo later calmed Ginta down, however, and Ginta defeated Girom with Gargoyle, to which Girom also survived. He later witnessed his sister killed by Ian in battle as punishment for her killing of her teammates in the 4th Round. In a filler episode of the anime, he alongside with Kouga and Pinocchio attacked Ginta, Dorothy, and Alviss at the time Babbo was cracked. Ginta barely survived his battle with him. After being repelled, Diana sent them to kidnap the Kaldea Elder, to which Ginta and Dorothy come to rescue him. He is last seen (also in the anime only) with the two somewhere riding Kung Fu Frog. A user of ice-based Nature ÄRMs.