Shisui Uchiha

Shisui Uchiha (うちはシスイ, Uchiha Shisui) - little is known about this character. He was the best friend of Itachi Uchiha and was very skilled. He was killed by him for Mangekyo Sharingan. The name 'Shisui' means 'still water', a reference to his drowning.

Shisui was also known as "Shisui of the Body Flicker" (瞬身のシスイ, Shunshin no Shisui), so it can be assumed he mastered that technique.