Hotaru

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

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 and after that becomes sort of master to Hotaru to hide from anyone who is after him. When a group ninja come looking for the Tsuchigumo clan's forbidden jutsu, Tonbei has Hotaru along with Utakata take the clan's forbidden jutsu so the ninja could not retrieve it. While traveling, Utakata gets upset at Hotaru for calling him master and then Naruto arrives claiming Utakata is attacking Hotaru. Hotaru breaks up the fight and Utakata leaves her seeing that Team 7 will protect her.

Trivia

 * Hotaru means "firefly".