OVA
Description
Gilgamesh (child) emerges as the youthful form of Gilgamesh after consuming a Potion of Youth from his treasury, the Gate of Babylon. This transformation reduces his physical age while preserving his golden hair and blood-red eyes, though his altered appearance sometimes obscures his identity from those familiar with his adult self.

As the child king of Uruk, he represented the "epitome of the ideal boy king," governing with renowned wisdom, fairness, and morality. His subjects praised his tolerance and captivating virtue, noting his respectful but unsubmissive stance toward divine authority. This contrasts starkly with his adult self's tyranny; the adult Gilgamesh views their personalities as fundamentally distinct, suggesting the child version might have halted his growth or embraced death had he foreseen his future. In *Fate/Grand Order*, he identifies his adult self as his greatest hatred and mourns the transformation.

His personality blends politeness, modesty, and superior social integration compared to his adult counterpart. Devoid of the "Conceitful" skill, he shows genuine care for others and enjoys popularity among children. He favors women reminiscent of "a flower that blooms in the wild" and, despite his clairvoyant knowledge of humanity’s end, silently observes and supports his Master without direct interference. He deliberately avoids contact with his adult self, anticipating lethal conflict.

Magically weaker than his adult form, he cannot deploy Noble Phantasms en masse from the Gate of Babylon. Instead, he employs precise strategy, targeting vulnerabilities with minimal weaponry. His unique ability, "The King’s Smile," stuns foes with a serene smile or petrifies them with a malevolent one—the latter lasting hours unless countered by courage. His skills include Charisma A+ (amplifying allies’ attack power), Golden Rule A (enhancing NP generation), and Fair Youth C (charming humanoid enemies). His Noble Phantasm remains Gate of Babylon, though weakened, inflicting debuffs like reduced NP strength and critical rates.

His portrayals remain consistent across media. In *Fate/hollow ataraxia*, he lives discreetly in Fuyuki City, avoiding past acquaintances while befriending local children. In *Fate/Grand Order*, he aids in events like the Amakusa Shirou Trial Quest, helping neutralize a hazardous Pseudo-Grail, and the Christmas Event, where he mistakenly transforms Jeanne Alter into a child by providing an incorrect potion. These depictions highlight his responsible yet occasionally fallible nature.