Darui

ダルイ

Darui is a jounin-level shinobi from Kumogakure. He also serves as the Commander of the First Division of the Allied Shinobi Forces.
Darui comes across as easy-going and mellow; contrasting with the Fourth Raikage's dramatic exit through a window, he tells C that he will simply use the door. Despite his laid-back demeanor, Darui is not lazy, rushing to the Raikage's defense when the other Kage's bodyguards overreact to the Raikage's actions. He also has a habit of describing things or events as "dull," a play on his name. Darui is quite apologetic, even apologizing for other people's actions, a trait he had never noticed in himself; this characteristic led him to say "sorry" just as often as "dull." He is also very loyal to the Raikage, who considers Darui his "second right hand." He addresses the Raikage as "boss" rather than "Raikage-sama."
Darui is fairly tall with dark skin, a slightly bulbous nose, a lazy look in his eyes, and white, shaggy hair that covers the left side of his face. He wears a high-collared sleeveless uniform, loose-fitting pants, and a one-strap-over-one-shoulder Flak Jacket typical of a Kumogakure Jounin. Darui has stylized characters for Water (水) and Lightning (雷) tattooed on his right and left shoulders, respectively, denoting his chakra's elemental affinities: Water Release and Lightning Release. The tattoo on his left arm also signifies that he has inherited the Third Raikage's technique. As a sword-user, Darui wields a broad, cleaver-like blade, which he carries on his back. However, he does not seem to carry it around with him in his village.
Darui is a highly skilled and capable shinobi. He learned to create Black Lightning under the tutelage of the Third Raikage, making his lightning techniques even more powerful. His chakra reserves are great enough that he does not die of chakra exhaustion after using three of the Treasured Tools of the Sage of the Six Paths, still having enough chakra left to continue fighting. His abilities have earned him the praise and recognition of the Fourth Raikage himself, who appointed Darui as his personal bodyguard and considers him his right-hand man.
Kenjutsu
Darui wields a long and fairly broad sword that is peculiar compared to other swords, as it folds in two to be sheathed and unfolds when in use. He has shown exceptional skills in kenjutsu, as he was able to clash with Suigetsu Hōzuki's Kubikiribōchō and easily overwhelm and pin him to a wall with his lightning-imbued sword. He was also skilled enough to literally disarm Ginkaku and Kinkaku during their battle, knocking Ginkaku into Kinkaku's Kōkinjō while quickly seizing the Shichiseiken and Benihisago.
Darui is proficient with water and lightning release techniques, and is able to use two separate techniques of these natures simultaneously. He uses Lightning Release: Wave of Inspiration, together with water release jutsus, to let electricity flow through the water and make the jutsus deadlier. He has shown exceptional skills with Lightning Release techniques individually, able to use Black Lightning, a special form of lightning passed down to him by the Third Raikage. With the power of the "Black Lightning", he could use techniques like the Lightning Release: Black Panther to immobilize and/or kill several enemies. According to one of his comrades, he is the only person to have inherited the Third Raikage's Black Lightning.
Darui is also proficient with the use of chakra flow with ballistic weapons. His skill with chakra flow is such that he was able to cut through a metal blade with a lightning-enhanced shuriken.
He also possesses the kekkei genkai known as Storm Release, which combines both lightning and water chakra to create beams of light that can be freely guided like missiles and cause powerful explosions.

Spoiler