Chōetsu

Utilizing his Rakutan, Akisu introverts the Kūkan onto himself, causing him to become see through. This in turn allows him to "transcend" through barriers and physical objects, allowing to pass through entire cities unseen. He can also utilize it to avoid attacks, particularly physical attacks such as Taijutsu and Kenjutsu. Perhaps most important, he can utilize Choetsu to avoid genjutsu, through the use of disrupting the space-time continuum, which allows a genjutsu to be cast. Akisu figured this out because he realized that genjutsu (or illusion) create a new world, whether in the opponent's mind or on a large scale.