Suito Kusanagi, a genetically engineered Kildren perpetually trapped in adolescence, serves as a fighter pilot and commander at Urisu Base in a corporatized war. Cloned from Maumi Orishina—a defector pilot killed by ace Lynx—her memories were altered to erase her origins, leaving her convinced she transferred from another base. Initially mirroring Maumi’s fervor for aerial combat, Suito reveled in missions and idolized Lynx as a mentor until trauma reshaped her. The death of squadmate Higasawa fractured her spirit, hardening her into a cold, withdrawn leader. Her entanglement with Lynx led to an unwanted pregnancy; he covertly preserved the fetus via artificial gestation, intensifying her resentment when he later defected to Lautern.

A disciplined commander, Suito clashes with superiors over high-risk tactics, occasionally joining sorties herself to showcase lethal piloting skills that unsettle subordinates. Her dynamic with Yuichi Kannami, a new transfer, evolves from aloofness to ambiguous tenderness, hinting at subconscious ties to her past. Subtle acts—like retrieving a broken match he discards, echoing a gesture of Jinroh Kurita, whom she euthanized—underscore layered connections.

Existential dread haunts her as a Kildren: her cloned daughter Mizuki, destined to physically surpass her, embodies the stagnation and cyclical identity she cannot escape. A post-credits arrival of Isamu Hiragi, mirroring Kannami’s mannerisms, reinforces this endless repetition. Expanded lore reveals Suito’s residual echoes of Maumi’s life—defection, dueling obsession, unresolved feelings for Lynx—culminating in a scripted city duel where she confronts corporate exploitation and her purposeless existence.

Caught between corporate machinery and fractured selfhood, Suito embodies engineered soldiers’ struggles with agency and memory. Her maternal bond with Mizuki, fraught encounters with pilots like Kannami and Lynx, and awareness of her replaceable nature frame her as both weapon and casualty of an unending war.