Hotaru

is the granddaughter of the former leader of the Tsuchigumo clan, En no Gyōja.

Six-Tailed Beast arc
Sometime before the start of the arc, Hotaru was under attack by a group of ninja who were actually after Utakata. Utakata saves Hotaru from the ninja, but was wounded in the battle. Hotaru ran for help from her village, saving Utakata's life, causing him to become indebted to her. After this, he became a sort of master to Hotaru in order to hide from anyone who is after him. When a group ninja came looking for the Tsuchigumo clan's kinjutsu, Tonbee had Hotaru, along with Utakata, take the clan's forbidden jutsu so that ninja could not retrieve it. While traveling, Utakata got upset at Hotaru for calling him, at which point Naruto arrived, believing Utakata to be attacking Hotaru. Hotaru broke up the fight and Utakata left her, deciding that Team 7 would be capable in protect her. As she watched him float away in a bubble, she tried to convince him not to leave, but was unsuccessful in doing so.

Trivia

 * means firefly.