Arui Gobetsu

"There are two ways you can chose now. Behind you are the vast plains of the Shinobi world, where you will be hunted down as a wild animal, and in front of you stand I, whom will cut you down in seconds. So what will it be? Walk the endless plains of lonely suffering or run forward, impaling yourself with the final judgment that's called my blade. In any way, the result is the same."

- Arui to a missing-nin who has just committed a murder.

Arui Gobetsu (劫罰暗涙, Gōbetsu Arui; literally "Silent Tears of Eternal Punishment") is a captain of the Hunter-nin devision of the ANBU corps of Kirigakure. He is famed due his enormous skills, including his master assassination abilities.

Onmyōdō
Arui's main power sterns from his Kekkei Genkai, the Onmyōdō (陰陽道, Way of Yin and Yang). It is a "soul" Kekkei Genkai, as Arui names it, that is not passed down through genetics, but appears randomly across the world, similar to the Rinnegan. It is a rather unique and strange Kekkei Genkai which allows the user to generate their own type of energy (that is, akin to the physical and spiritual energy required to form chakra) which essentially overpowers the two "standard" ones, rendering the user unable to form any type of elemental ninjutsu. Instead, it grants the user enhanced physical prowess and an extraordinary ability to manipulate Yin and Yang energy at a normally almost unattainable level.

Senjutsu
Arui has received Sage training from his old sensei, whom was a sage himself, but was a unique case, as he was unable to absorb Natural Energy due his Kekkei Genkai. Through hard training and practice, he found an alternate method of using the profits of Sage Mode. While he cannot enter Sage Mode itself, he can create jutsu by drawing in natural energy and molding it directly, outside of his body. Because he has no elemental nature due his Kekkei Genkai, this caused no drawbacks, as he would be unable to add an element to the energy normally.

Using this alternate technique, he can greatly enhance his normal jutsu, including his trademark technique Severing Void. However, he cannot use natural energy continuously, due the conflict with his Kekkei Genkai's unique energy.

Trivia

 * Arui's theme is The Best It's Gonna Get by Celldweller.