Yūgao Uzuki

is a member of the Konoha's ANBU and Hayate Gekko's lover. After Hayate is killed by Baki, Yugao swears to avenge him, though it is unknown if she actually knows who killed him. She was a member of the ANBU squad of Kakashi when he was a member, along with Tenzo.

Yugao also has a small role in Naruto: Shippūden's Fire Temple filler arc. While Sora is spying on Danzo's and Tatsuji's interrogation, Yugao and two other ANBU catch him in ceiling and turn him over to Tsunade. Although Yugao's face is unseen, it is clear that it is her by her distinct long purple hair behind her ANBU mask.

Role in Naruto Video Games
Yugao was added as a playable character in the English-language exclusive Wii game Naruto: Clash of Ninja Revolution 2. In the game, she possesses techniques similar to Hayate's. While it is unclear if she uncovered the identity of Hayate's killer, her battle cry when using Dance of the Crescent Moon when fighting Baki in the game changes to "Revenge... for Hayate!". She has a small role in the game's story appearing in the antagonists' hideout to save Naruto, Kakashi, Gaara and Sakura from a group of missing-nin, stating that the ANBU would take care of the situation. She also has a team special with Kakashi, most likely due to the fact that she refers to him as her superior. Yugao also appears as a playable character in Naruto Shippūden: Gekitō Ninja Taisen! EX 3 for the Wii. She is also the model of the female ANBU party member in Naruto: Path of the Ninja 2, but the player bequeaths her with any name they please.

Trivia

 * "Uzuki" is the old name for the fourth month of the Japanese lunar calendar, while "Yugao" means "moonflower".