Shisui Uchiha is indirectly one of the most important character of Naruto series... It was from him that Itachi formed his Ninja way and it was from Itachi that Sasuke found his Ninja way.Sasuke is currently fighting to save humanity....Shisui and Itachi were the only Uchihas against the coup and trying to stop it to avoid a full scale war(which they did).His death awakened Itachi's mangekyou and also, Itachi used Shisui's eyes to break free and undid the Reanimation saving the majority of Allied shinobi forces...so this implies that even though Shisui died a long time ago, he probably influenced the NV in more ways than most of the living characters..Please post what you think.
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