Satsuki Kiryuuin

Satsuki is commanding, disciplined, intelligent, and almost unnaturally composed. She believes that authority must be demonstrated through strength and builds Honnouji Academy around a hierarchy in which successful students receive increasingly powerful uniforms and social privileges.

Her apparent arrogance is supported by extraordinary personal resolve. Satsuki willingly subjects herself to the dangerous Junketsu through force of will and expects herself to endure the same severity she imposes on everyone around her. She rarely asks subordinates to face something she is entirely unwilling to confront herself.

Despite her authoritarian behavior, Satsuki inspires genuine loyalty in the Elite Four. She recognizes ability, gives talented people opportunities to prove themselves, and maintains long-standing personal bonds beneath the formal distance of her leadership.

Satsuki is an exceptional swordswoman whose primary weapon is Bakuzan, a katana capable of cutting Life Fibers. Her speed, strength, reactions, and technique allow her to compete with enhanced opponents even before accounting for her Kamui.

Junketsu is the Kiryuuin family's Kamui. Satsuki forces the living garment to submit to her and uses its transformation to obtain tremendous physical enhancement. Unlike Ryuuko and Senketsu's cooperative synchronization, Satsuki's early relationship with Junketsu is based on domination, making prolonged use more physically demanding.

Satsuki is also an accomplished strategist and commander. Honnouji's club system, Naturals Election, Goku Uniform hierarchy, and military organization operate under her direction, while the Elite Four function as commanders capable of carrying out complex operations independently.

Bakuzan is eventually broken into two blades, Bakuzan Gako and Bakuzan Kouryu. Satsuki continues fighting after losing Junketsu, demonstrating that her combat ability was never dependent entirely on a Kamui.

Satsuki initially stands at the top of the system Ryuuko intends to fight through. She uses Honnouji Academy's clubs and Elite Four to test challengers while expanding the school's influence beyond its own territory.

Her ambitions eventually extend into the Tri-City Schools Raid, through which Honnouji attacks rival academies in Kyoto, Osaka, and Kobe. Her willingness to militarize the school makes her appear to be consolidating the Kiryuuin family's control.

Satsuki's apparent loyalty to Ragyou is ultimately a deception. She has spent years turning Honnouji Academy into a private army capable of rebelling against her mother and destroying the Life Fibers. During the Cultural and Sports Grand Festival, she openly betrays Ragyou and attempts to kill her.

Ragyou survives, defeats Satsuki, and strips her of control over Honnouji. Satsuki subsequently joins Nudist Beach and reconciles with Ryuuko after the revelation that the two are sisters.

Satsuki and the Elite Four ultimately fight alongside Ryuuko during the final confrontation with Ragyou. After the Life Fiber crisis ends, she abandons the severe image around which she built her campaign and begins establishing a more ordinary relationship with Ryuuko.

Ryuuko Matoi begins as Satsuki's unpredictable challenger and principal rival. Satsuki deliberately tests Ryuuko Matoi's strength while withholding much of what she knows. They are eventually revealed to be sisters, and after overcoming their hostility they fight together against their mother.

Ragyou Kiryuuin is Satsuki's mother, chair of Honnouji Academy, and CEO of REVOCS. Satsuki secretly despises Ragyou and has spent years preparing Honnouji Academy specifically to overthrow her and destroy the Life Fibers.

Nonon Jakuzure is one of Satsuki's Elite Four and has known her since childhood, giving their relationship a familiarity that few other subordinates share.

Ira Gamagoori, Uzu Sanageyama, and Houka Inumuta complete Satsuki's Elite Four. Each follows her because she personally earned their loyalty rather than simply because of her family name.

Mitsuzou Soroi is Satsuki's personal butler and a trusted presence who has served her since childhood.

Nui Harime serves Ragyou as REVOCS' Grand Couturier and becomes one of Satsuki's most dangerous opponents once Satsuki openly rebels against her mother.