Bunwa Kaku, recognized as Jia Xu from Romance of the Three Kingdoms lore, starts as Chuuei Toutaku's second-in-command at Rakuyo High School before transferring to Kyosho Academy after Toutaku's demise. She has raven-black hair tied in two tails, purple eyes, and wears glasses, standing 161 cm tall with measurements of B86-W59-H87 cm. Initially clad in Rakuyo's official uniform—a red blazer, red skirt, and knee-high socks—she later adopts Kyosho's attire upon switching allegiances. Her personality combines high intelligence and strategic brilliance with a manipulative, cold-blooded edge. Preferring indirect tactics over direct combat, she orchestrates conflicts by exploiting other fighters, frequently leveraging seduction to achieve goals. Pragmatic and calculating, she rarely acts impulsively, though her methods foster distrust even among allies. She reserves genuine affection and loyalty exclusively for Houkou Kakuka, sharing both a romantic bond and strategic partnership. During *Ikkitousen: Dragon Destiny*, she drives Kyosho's consolidation of power, expanding its territory while reveling in manipulating fighters' "fates." Her relationship with Kakuka intensifies, but his death shatters her. Sousou Moutoku dismisses her as Kyosho's strategist due to distrust, installing Chuutatsu Shibai as her replacement. After surviving an assault by Bunen Choryo and disillusioned by betrayals from Toutaku and Sousou, she operates independently. She later manipulates Myousai Kakouen into seeking the Dragon Jade to undermine Shibai, though she misses the Battle of Red Cliffs. The season ends with her encountering Genjou Kakouton, who hunts for Sousou. Manga iterations amplify her seductive cunning. Under Toutaku's orders, she awakens Ryubi's dragon by impersonating Ryomou Shimei and fabricating a rape video to provoke Teifu. Her alliances shift fluidly; she engages in sexual relationships with collaborators like Toutaku, Kakuka, and later Junyu. After joining Sousou, she remains Kakuka's lover while covertly exploiting Kyosho's resources. Across all narratives, she evolves from loyal subordinate to self-directed strategist after repeated betrayals. Her bond with Kakuka anchors her development, defined by mutual trust and shared ambitions. Following his death and her expulsion from Kyosho, she operates alone, prioritizing her own agenda over factional ties.