Ushiwakamaru, recognized as the adult general Minamoto-no-Yoshitsune, is a Rider-class Servant drawn from Japan’s storied past. A tactician marked by tragedy, she honed her martial and strategic prowess under the onmyouji Kiichi Hougen at Kurama Temple, employing unorthodox methods such as manipulating Hougen’s daughter to obtain restricted teachings. Deprived of familial affection in her youth, she anchored her identity in unwavering loyalty and service, traits that eclipsed her grasp of human emotions or political nuance. Her brother Minamoto-no-Yoritomo’s betrayal, driven by dread of her strategic genius and perceived inhumanity, cemented her fatal legacy, which manifests in her Servant form as an unflinching devotion to her master and a detached, methodical approach to warfare. She operates as an instrument of her lord’s will, valuing cold efficacy over camaraderie, yet secretly yearns for the Holy Grail to mend her fractured bond with Yoritomo. Summoned by Gilgamesh during the Babylonia Singularity, she spearheads Uruk’s defense against Tiamat’s demonic hordes. Her battlefield acumen proves indispensable, though her clinical demeanor strains alliances. This arc culminates in her corruption via Kingu’s manipulation of Tiamat’s Chaos Tide, twisting her into a Berserker with Beast-class traits. The transformation unleashes her suppressed loathing for humanity, aligning her with Tiamat’s annihilation agenda. Empowered by the Sea of Life, she gains infinite self-replication, necessitating the destruction of the Tide itself to halt her onslaught. Her rampage culminates in a duel against former allies, including the Lancer Musashibou Benkei, who once disavowed his historical counterpart’s legacy. Benkei’s sacrificial intervention severs her link to the Tide, dissolving her Spirit Origin after he confronts her enduring solitude and wrath. Alternate timelines showcase her adaptability: in *Fate/Requiem*, she serves Rurihime as a shrine vendor, her discipline intact despite the mundane setting, while in *Melty Blood: Type Lumina*, Neco-Arc enlists her to impose order in the Tsukihime realm, clad in streamlined armor. Her adult incarnation, visually paralleling Taira-no-Kagekiyo, remains an elusive figure, juxtaposing her youthful visage with martial maturity. Across iterations, her narrative orbits an eternal contradiction: a legendary strategist eternally severed from human connection by her emotional detachment, even as her actions reverberate through history.