Darui

is a Kumogakure Jonin who escorts the current Raikage to the Kage summit, along with Shī.

Personality
In his first appearance, Darui is portrayed as easy-going and mellow; when compared to the Raikage's over-the-top exit through a window, (destroying a wall along with it), he tells Shī that he'll just use the door. Whilst having a more laid-back demeanor compared to his leader, Darui isn't lazy, leaping to the Raikage's defense when the bodyguards of the other Kages' over-react to the Raikage's reactions.

Appearance
Darui has a dark skin tone, a slightly bulbous nose, a lazy look in his eyes and white hair in a shaggy hair style. He also appears to be quite tall in stature, almost as tall as the Raikage. Darui has so far only been seen in the sleeveless uniform and one-strap-over-one-shoulder Flak Jacket of a Kumogakure Jonin. Darui also has the characters for and  tattooed on his right and left shoulders respectively, denoting his chakra's elemental nature affinities; Water Release and Lightning Release.

As a sword-user, Darui wields a large, cleaver-like blade called a 'Zanbatō', which he is shown carring it on his back, sheathless, during the Kage summit--although he wasn't seen carring it with him around in his home village.

Five Kage Summit arc
He and Shī were chosen to escort the Raikage to the Five Kage Summit in the Land of Iron. When the Raikage jumped through a window, he tells Shī that he'd rather use the door. During the Kage meeting, he quickly jumped to protect the Raikage after he smashed the table, because the bodyguards of the other Kage entered into defensive position. After the other bodyguards returned to their respective place, Darui and Shī did the same.

When White Zetsu appears during the Five Kage Summit, Darui, along with Shī, guards the Raikage and follow him to the meeting with Sasuke Uchiha. Suigetsu charged at Shī only to be stopped by Darui and they started battling. Darui and Suigetsu continue their sword fight while the Raikage deals with Jugo and Sasuke. Darui then incapacitates Suigetsu by stabbing a blade into his chest and instilling it with Lighting Release. He then goes to assist Shī who had been knocked unconscious by Sasuke's genjutsu. He watched as the Raikage seemingly sacrificed his arm and prepares to deal a final blow to Sasuke.

Sasuke counters, and the Raikage is saved from further injury by Gaara. As the Raikage is being healed by Shī, Darui decides to help Gaara, Temari and Kankuro in defeating Sasuke. As they all attack together, Sasuke once again counters with a new form of Susanoo. After Sasuke uses Susanoo to collapse the ceiling onto his enemies, Darui is protected by a sand shield conjured by Gaara. Afterward, he follows the Raikage to chase down Sasuke.

Swordsmanship
When the Raikage smashed the table and the bodyguards moved to protect their respective Kages, Darui showed a long and fairly broad sword that seems a little particular from others swords as it folds in two to be sheathed and unfolds when in use. He can charge his broad sword with electricity that can stay charged even when he isn't making contact with it. This technique is similar to Killer Bee's Lightning Release: Lightning Swords, or Sasuke's Kusanagi Sword: Chidori Katana.

Elemental Techniques
Darui has also shown to be proficient with Water Release and Lightning Release techniques, being able to use them both simultaneously. Darui is shown using what is presumably a Kekkei Genkai known as Storm Release, which combines both Lightning and Water chakra to create beams of light that can be guided like missiles and cause powerful explosions.

Trivia

 * Darui is Japanese for "sluggish," "dull," referring to his lazy, languid way of speaking.