Kagen Uchiha was a low-profile member of Konohagakure's Uchiha clan, a police logistics worker of modest gifts. His obscurity makes him an ideal mark for Root, which kills him and slips disguised agents into his place to spy on his own clan.
He is remembered as an unremarkable figure, a clansman of ordinary ability with no close family to speak of, which is precisely what makes him so exploitable.
Kagen serves in the logistics arm of the Konoha Military Police Force, a posting that never gives him cause to awaken the Sharingan. That, together with his middling talent and lack of close relatives, marks him as the perfect target for Root. The organisation kills him and turns to the twins Gozu and Mezu, surgically altered to resemble him, having them share the job of impersonating Kagen so they can spy on the Uchiha clan from within.

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Kagen Uchiha is a low profile, unremarkable member of Konohagakure's Uchiha clan who works in the logistics arm of the Konoha Military Police Force before being killed and impersonated by Root.
Root targets Kagen Uchiha because his ordinary talent and lack of close relatives make him an ideal mark whose identity can be stolen without drawing attention.
After killing Kagen Uchiha, Root has the twins Gozu and Mezu surgically altered to resemble him, and the pair share the job of impersonating him to spy on the Uchiha clan from within.
Kagen Uchiha served in the logistics arm of the Konoha Military Police Force, a desk bound posting that never gave him cause to awaken the Sharingan.
No, Kagen Uchiha's modest talent and logistics posting meant he never had cause to awaken the Sharingan before he was killed by Root.
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