Yugi defeats Gurimo, and his soul is absorbed by the "The Seal of Orichalcos". It is unknown what officially became of his soul at the end of the arc, though it was likely released as every other soul captured on-screen by the Seal was set free.
Gurimo Duels strategically, and appears decently skilled as he was presumably able to defeat both Weevil and Rex at the same time. He shows complete loyalty to the organization to which he belongs.
Gurimo runs a Warrior Deck, focused on a Swarm strategy. His monsters' otherwise mediocre ATK are increased by both "The Seal of Orichalcos" and "The A. Forces". His Deck and its swarm ability is also able to take advantage of the fact that "The Seal of Orichalcos" allows him to control up to 10 monsters at once, as he places his more vulnerable monsters in the back row to prevent them from being attacked while his more defensive monsters are summoned to the front row. This strategy also can work well with "Obelisk the Tormentor", as it gives him enough monsters to Tribute for both its Summon and effect.
In the English dubbed anime, Gurimo's name is never spoken out loud for unknown reasons, instead mostly being referred to as "the old man" by Alister and Valon. Eric Stuart, Seto Kaiba's voice actor in the dub, stated once that his name was "Grerimo", but this was retconned by multiple more recent sources, including Konami's blog.