Darui

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

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 ther 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.

Abilities
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's also shown to be proficient with Water Release and Lightning Release techniques, being able to use them both simultaneously.

Trivia

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