Souei, an Ogre Tribe survivor of an orc-led massacre, escaped with five others including Benimaru before integrating into Rimuru Tempest’s nascent village. Renamed and evolved by Rimuru into a Fair Oni, he ascended as Minister of Intelligence in the Jura-Tempest Federation, commanding the covert Kurayami division to oversee espionage operations. His Ogre form featured a lean, muscular physique with dark skin, blue-tinted features, and a solitary white horn. Post-evolution, he adopted a human-like stature of 180 centimeters, clad in dark blue stealth-optimized attire, with blue hair partially obscuring one eye—a trademark contrast to his composed demeanor. Stoic yet fiercely loyal to Rimuru, Souei exhibits stern protectiveness toward his leader’s honor. His dry wit and eloquence mask a self-aware theatricality in embracing ninja tropes, balanced by ruthless operational efficiency. A childhood bond with Benimaru evolved from retainer dynamics to peer equality under Rimuru’s command. Specializing in espionage and assassination, Souei wields shadow clones, spatial manipulation, and threads. Key abilities include Parallel Existence for multitasking, Ultraspeed Action for combat precision, and Universal Perception for threat detection. The Ultimate Gift Tsukuyomi synergizes prior skills like Shadow Striker and Spatial Motion, augmenting stealth tactics. His arsenal features Legend-grade blades, kunai, and resistances to physical, spiritual, and elemental assaults. Career progression spans from securing Rimuru’s early village to orchestrating counterintelligence against rival nations. Hakurou’s mentorship honed his dual-blade mastery, though magical surveillance still necessitates collaboration with allies like Shuna or Diablo. Notable trivia includes a fondness for cats, disclosed in Slime Diaries, and an age matching Benimaru’s. His structured approach to duty thrives on executing precise commands, reflecting a preference for ordered service.