Rikishi

Rikishi (力士, Rikishi) is a character created by Sir Aether and is a member of Kirigakure's Hunter-nin.

Background
At the age of 20, Rikishi was recruited by the Hunter-nin due to his advanced knowledge of human anatomy and medicine. He also taught Sanger, Higure and Hibana human anatomy and basic medical skills a part of the own Hunter-nin training.

Sanger Hiden: Frozen Resolve
When Sanger is assigned to travel to the Land of Rainforests to kill several important members of Shizen'na, the Fifth Mizukage, Mei Terumī assigned Rikishi, along with Hibana and Higure to aid him. After describing his abilities to Sanger, the team of four depart Kirigakure the next day.