Kurotsuchi

is a ninja of Iwagakure and a bodyguard of the Ōnoki, the Tsuchikage.

Appearance
Kurosuchi's has short black hair with slim eyes. He/she wears fishnet tights on his/her legs and a black skirt over it

Five Kage Summit arc
Kurotsuchi and Akatsuchi escort Ōnoki to the Five Kage meeting. When they are leaving Ōnoki hurts his hips trying to carry his own luggage, so Kurotsuchi suggests that he should retire. After arriving in the Land of Iron and the the meeting gets underway, Kurotsuchi comes to the Tsuchikage's defense during the current Raikage's outburst.

When Kurotsuchi hears that Sasuke Uchiha has infiltrated the meeting, he/she asks for permission to fight the man who killed Deidara(whom he/she refers to as "Deidara-nii", indicating that he/she might have known him). Ōnoki agrees but tells him/her to keep out of the Raikage's way. He/she watches Sasuke's battle from the shadows and, when Sasuke causes the room to collapse, creates a dome to protect his or herself from falling debris. He/she is also able to fend off Zetsu's Spore Technique.

While leaving the Land of Iron to inform the Land of Earth's Daimyo of the Shinobe/Samurai alliance, he/she suggests to Onoki that they should eliminate Killer Bee and Naruto so they can foil Madara Uchiha's Moon's Eye Plan and weaken Konohagakure and Kumogakure. Having heard him decide against the plan, he/she speaks back exclaiming that he isn't acting like the stubborn old man he/she knew of.

Trivia

 * The name, means "Black Earth", is a possible allusion to Ancient Egypt; the land on either side of the River Nile was known as "Kemet", which means the "Black Earth" or "Black Land", so named for the dark-colored silt that was deposited on the banks of the River Nile when the river would flood before the Aswan Dam was built.  Also, Kurotsuchi's fellow bodyguard, Akatsuchi, whose name means "Red Earth", is another possible allusion towards Ancient Egypt; most of Ancient Egypt was comprised of desert, which was known as "Dashret", which means the "Red Land" or "Red Earth", and where the word desert comes from.
 * Kurotsuchi is a androgyne character, his or her gender has yet to be confirmed as male or female. He or she is hinted to have admired Deidara, and also seems to have an interest in Sasuke Uchiha.

Quotes

 * (To Onoki) ''"If we destroy the Hachibi and the Kyubi, that will put an end to Madara's plan. And we'll be able to weaken Kumo and Konoha as well. It's two birds with one stone!"