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.

Shisui was also known as, so it can be assumed he mastered the technique.

Trivia

 * Shisui means "still water", which is a reference to his death by drowning.