Nagatomo

Nagatomo is a Jonin level ninja that previously hailed from Takigakure and currently serves for Sunagakure, deflecting to the nation during the First Shinobi World War. He deflected to Sunagakure because of him acquiring the Kinjutsu, the Earth Grudge Fear allowing to live with a never ageing appearance of his 22 year old appearance and living eternally - essentially being immortal. Although being less known than Kakuzu, he however proven more than capable of beating him, from multiple times of clashing.