Renri, designated Renri Synthesis Twenty-Seven, served as a high-ranking Integrity Knight within the Human Empire’s Order, wielding the Divine Object-class weapon Twin Edged Wings. Though esteemed in rank, he was entombed in cryostasis for decades after failing to master the Armament Full Control Art—a shortcoming rooted in suppressed trauma. As a youth, his prodigious swordsmanship led to tragedy when he fatally struck his childhood friend during the Four Empires Unity Tournament finals. The incident instilled a crippling fear of combat and lingering guilt, emotions that survived the memory-altering Synthesis Ritual meant to purge such vulnerabilities.

His appearance mirrored his physical stasis at age fifteen: slight in stature, round-cheeked, and boyishly youthful. Silver armor and emerald garments denoted his knighthood, yet his hesitant demeanor contrasted sharply with the unwavering resolve expected of his rank. Comparisons to Alice Synthesis Thirty, whose ascendance eclipsed his early accolades, deepened his sense of inadequacy.

Awakened after Quinella’s downfall to aid in repelling the Dark Territory invasion, Renri was tasked with commanding the Human Guardian Army’s Second Unit left flank at the Great Eastern Gate. Overcome by terror, he abandoned his post initially. A pivotal encounter with Kirito’s defiance during the battle’s climax rekindled his resolve, enabling him to activate Twin Edged Wings’ latent power and redeem himself in crucial engagements. He later joined a diversionary operation to misdirect enemy forces, emerging as a survivor of the war.

Renri’s journey centered on shattering self-imposed psychological chains, evolving from a trauma-crippled knight into a warrior capable of wielding his dormant prowess. His contributions included safeguarding supply lines and engaging Dark Territory adversaries, intertwining his personal growth with the Human Empire’s struggle for survival.