Gilgamesh's second alternate outfit, 'Special Steel Armor', is based on his recurring battle sprite in 2D games, first seen in Final Fantasy V. His EX Mode appearance is based on his Final Fantasy XII design, giving him bright red armor with skirt pieces around his legs. He wears lighter armor and a red cloak and hood that obscures most of his head and face. Gilgamesh's first alternate outfit, 'Special Red Cloak,' is based on his Final Fantasy VIII design. His EX Mode is based on his transformed form from Final Fantasy V, giving him eight arms and different armor. He wears primarily red and gray armor with yellow accents, gray shorts with red polka-dots, and a horned hood. Gilgamesh's base appearance is based on his original concept art by Yoshitaka Amano for Final Fantasy V.

The player will need to go to the Reports section and beat the sixth scenario in Report 8 with Bartz to unlock Gilgamesh in the PP Catalog as a purchasable character for 300 PP. To unlock him as a playable character, the player must beat the Dissidia 012 Final Fantasy storyline, then complete the first chapter of the 013 story. Though he is treated as a villain, Gilgamesh is an outsider to the cycles of war, and it is left ambiguous as to whether he was summoned by Chaos or just happened upon World B and the cycles of war by chance while traveling between worlds. In Dissidia 012 Final Fantasy, Gilgamesh is seeking Bartz, wishing to challenge his old rival to their promised rematch. Since then, he has been travelling between worlds collecting rare weapons and challenging worthy enemies to battle. Introduced as Exdeath's most prominent lieutenant, he was banished to the Interdimensional Rift after repeatedly failing his assignments.

Gilgamesh is a secret playable character in Dissidia 012 Final Fantasy, representing Final Fantasy V.

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