Sakamoto Days unleashes its most terrifying antagonist through Kei Uzuki, a serial killer masquerading as an assassin who has systematically obliterated one-fourth of Japan's underground hitman network. This white-haired executioner operates under the codenames "X" and "Slur," leaving behind mutilated corpses marked with his signature cross symbol.
Uzuki transcends conventional power measurements through his weaponized mental disorder. Dissociative Identity Disorder becomes his ultimate ability, allowing him to absorb and replicate the complete combat profiles of defeated opponents. The Takamura and Rion personas alone elevate him beyond most elite assassins, making him a shape-shifting nightmare that adapts to surpass any challenge.
Sakamoto Days presents Uzuki as a master combatant whose base abilities already place him among the elite. His physical statistics have been officially rated at five out of five in the series' fan book. This puts him on equal footing with legendary figures like Sakamoto himself and the deadly Nagumo. His natural speed allows him to blitz multiple opponents simultaneously.

The assassin's weapon of choice is a segmented sword-whip hybrid. This versatile blade can function as both a close-combat sword and a mid-range whip. His mastery of this weapon is so complete that he can simultaneously attack and defend. During battles, he has demonstrated the ability to deflect bullets while maintaining offensive pressure on his opponents.
Uzuki's durability is equally impressive in Sakamoto Days. He has survived multiple impalements and severe injuries that would incapacitate most fighters. His unique medical condition, situs inversus, places his heart on the right side of his chest.
Uzuki’s different personas' power level in Sakamoto Days

Among Uzuki's multiple personalities, the Takamura persona stands as the most devastating. Sakamoto Days introduced Takamura as possibly the most powerful figure in the series. This legendary swordsman once fought five elite assassins simultaneously, including Sakamoto, Nagumo, and others, emerging with only the loss of an eye.
When Uzuki taps into Takamura’s persona, he unlocks devastating swordsmanship skills. The transformation is so complete that even those who knew the original Takamura struggle to distinguish between them. This persona granted Uzuki the power to defeat the actual Takamura in single combat. However, controlling this personality remains problematic, as Takamura's violent nature overwhelms Uzuki's consciousness.
The Rion personality offers Uzuki a different but equally valuable skill set in Sakamoto Days. Unlike the overwhelming force of Takamura, Rion brings tactical precision and supernatural perception abilities. Her signature technique, "Killing Path," allows the user to visualize multiple routes to eliminate targets simultaneously.
This power reveals itself as imaginary lines that mark every possible angle of attack. The user can analyze and select the most efficient method to neutralize opponents. Rion's marksmanship skills are among the finest in the series. Her combination of analytical combat and exceptional shooting accuracy makes this persona invaluable for strategic encounters.
Rion's personality also demonstrates superior emotional control compared to Takamura. Sakamoto Days shows that Uzuki maintains better command over this persona. The Rion personality has displayed significant physical strength, easily overpowering skilled opponents and sending them flying through buildings.
The limitation factor

Despite his overwhelming abilities, the series reveals significant limitations in Uzuki's power. His inability to fully control the Takamura persona creates unpredictable situations. This personality can turn against allies or act beyond Uzuki's conscious direction. Such loss of control represents a critical vulnerability in extended conflicts.
The emotional toll of accessing traumatic personas also affects his performance. Each personality carries the psychological baggage of its origin, potentially compromising Uzuki's decision-making. His guilt over killing Rion continues to influence his actions, creating internal conflicts that skilled opponents might exploit.
In the current Sakamoto Days power hierarchy, Uzuki stands at the absolute pinnacle. Not a single member of Team Sakamoto can rival his strength in a head-to-head fight. Even elite Order members fall before his overwhelming skill combination. Only Takamura posed a legitimate threat, and that obstacle has been eliminated.
Sakamoto Days positions Uzuki as a villain whose power ceiling remains undefined. If he gains the ability to seamlessly combine persona abilities or acquires additional powerful personalities, even theoretical limitations might disappear. His current status as the series's primary antagonist reflects this enormous potential for growth.
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