Kin Tsuchi

was a Genin-level ninja from Otogakure. She took part in the Chūnin Exam under orders from Orochimaru to kill Sasuke Uchiha. She was the only one of her team to not have a physical alteration.

Chūnin Exam arc
Kin and the rest of Team Dosu attacked Sakura during the second phase of the Chūnin Exams in their attempt to kill Sasuke. When Team 10 came to Sakura's aid, Kin's body was taken over by Ino Yamanaka's Mind Body Switch Technique, and, because of that, she was injured by her own teammate, Zaku.

In the third stage preliminaries, she was matched against Shikamaru Nara. Shikamaru initially believed her trick to be a simple combination of needles with and without bells in order to make him less alert of the latter. Kin, however, followed through using her strings to ring a previously thrown bell, further confusing Shikamaru. Shikamaru countered, contracting his shadow and minimizing it under the string attached to a needle she threw; she didn't notice that a string at that height wouldn't be able to cast a shadow. Shikamaru then proceeded to use Shadow Imitation Technique to make the both of them throw a shuriken simultaneously. While Shikamaru was able to duck, Kin was too close to the wall and hit her head, knocking her out.

Invasion of Konoha arc
Kin, along with Zaku, was later betrayed and used by Orochimaru as sacrifices to summon Hashirama Senju and Tobirama Senju from their graves with Impure World Resurrection.

Abilities
Kin was an accomplished Senbon user, as seen in the Chūnin Exams. When she was ordered by Zaku to "finish Sakura", she reached into her back pocket and grasped senbon instead of a Kunai or a summoning scroll. In her main technique, Illusion Bell Needles, she also used senbon. While fighting Shikamaru, she aimed at a vital point at his arm and shoulder.

Naruto Special: Finally a Clash Jounin VS Genin
Standing beside Hanabi Hyūga before the start of the event.

Trivia

 * Kin is named for the sound of metal clashing, specifically samurai swords in battle.
 * In addition, Kin can mean "gold" in Japanese.
 * Tsuchi means Earth. It's also the Japanese name for one of the three ear bones, hammer.
 * Like many of the other characters, Kin appeared in the omake at the end of Naruto Shippūden episode 129, along with the rest of team Dosu

Quotes

 * (To Shikamaru) "You don't ever ask for whom the bell tolls, because it tolls for thee."