Kiseru Gankubi
Kiseru Gankubi is an Anbu from Konohagakure who's best known for his undercover work—he spent time embedded with Kara as one of their Outers before his cover was blown or he extracted himself from the organization.
As a fighter, he's genuinely formidable. What stands out is his ability to hold his own against multiple skilled opponents at once, which is saying something in a world full of trained killers. Even when the odds aren't in his favor, he tends to come out on top.
Content compiled by AnimeList.moe from publicly available sources.
