Denka
Denka is a ninja cat who lives with Nekobaa at an Uchiha supply base. He's got surprisingly sharp senses—he was able to pick up on Sasuke's chakra and actually remembered him even after they'd been apart for years, which impressed fans who didn't expect that level of awareness from a cat character.
There's a running joke where Suigetsu completely mistakes him for a tanuki, which says something about either Suigetsu's observational skills or just how unusual Denka is.
Content compiled by AnimeList.moe from publicly available sources.
