Shinsui Genmu

Shūrin Fukitsukage (影不吉影秋霖, Fukitsukage Shūrin; lit. "Sinister Presence, Autumn Rain") better known by his pseudonym Shinsui Genmu (幻夢浸水, Genmu Shinsui) is a member of the Fukitsukage Clan who immigrated from the Land of Focus to the Land of Fire with his father, Fuyuzora, after his mother's demise and his family business failed. As Shinsui Genmu, Shūrin quickly rose to the ranks of Tokubetsu Jōnin and eventually joined the Anbu. As an experienced Anbu member, Shinsui is exactly what a special operation officer should be, a detached and morally ambiguous soldier who only cares about fulfilling his mission.

Shūrin uses his position in Anbu along with the unique attire to conceal his clan's rare dōjutsu, the Makyūgan. Due to a certain event in his history, Shūrin and his father, chose to forsake their village and identity and give their lives a brand new start in Konoha; as such, the Shinsui persona serves as a barricade that separates his lived reality from people's perceived reality.

As fate would have it, he would be placed under the tutelage of Katoku Hatake and would develop a rivalry with his brother's student, Takehiko; practically mirroring Katoku's and Yasaki's rivalry but turned up a notch. At some point in his career as a Tokubetsu Jōnin, he received the moniker of Second Coming of Watatsumi (綿津見の再来, Watatsumi no Sairai; lit.: "Reincarnation of Neptune") due to his mastery of water-style. The burden of living a dual-life with no true identity to embrace would leave Shūrin entangled in a quest for finding his own identity and purpose.

Trivia

 * Shūrin as both himself and Shinsui embraces utilitarianism & stoicism.