Hanabi Hyūga

is a kunoichi from Konohagakure's Hyūga clan.

Background
Hanabi is the younger daughter of the Hyūga clan's head, Hiashi Hyūga. Since she was considered more talented, and confident than her elder sister Hinata, their father decided to make Hanabi the heiress to the clan, and instead focused his gruelling training regime on her instead of her sister, whose training he considered to be a waste of time.

Personality
Hanabi's character has not been expanded on in the manga or even the anime very much. From what is noted of her appearance in various media (such as Naruto video games), Hanabi seems to be a quiet, polite and respectful girl, although she seems to open up to people a bit easier than her sister. Unlike how Hinata once was, Hanabi is more confident in her abilities.

Appearance
Hanabi has dark brown hair with long parted bangs with a single lock of hair falling into her face. She also has large, white eyes - a trait shared by all members of her clan. In the anime, her eyes have a hint of lilac in them. In Part I, she was seen wearing a sleeveless, blue v-neck shirt, with mesh armour underneath and blue shorts and sandals.

Abilities
Relatively nothing is known of Hanabi's skills at this point other than it was stated during the Chūnin Exams that she possesses a stronger Byakugan than her sister's but weaker than Neji's. In the anime it was shown that she is very skilled with taijutsu even at her young age as she was able to knock out Hinata in a sparring duel. It can be assumed also, that as a wielder of the Byakugan, she has near 360° of vision as well as the ability to see through objects amongst other ocular abilities granted by the eyes.

Chūnin Exam Arc
Hanabi watched Neji's match against Naruto during the final round of the Chūnin Exams with her father, and was amazed to see that he had learned powerful secret techniques on his own. It was also indicated that she knew nothing about the failed attempt to kidnap Hinata that had resulted in Hizashi's death, mostly because she wasn't born at that time, as she did not know how her father could still be alive after the Land of Lightning demanded his death.

Invasion of Konoha Arc
In the anime, she appeared with her father at the funeral of the Third Hokage.

Search for Tsunade Arc
In the anime, she also attended Tsunade's inauguration as the next Hokage, standing with her cousin Neji and his team-mate Tenten.

Invasion of Pain Arc
Although she didn't make an actual appearance, Hanabi was seen in a flashback sparring and overcoming Hinata, much to Hinata's dismay. She is noted to be away with her father during Pain's attack on Konoha.

Final Arc
When Madara trapped almost everyone in his Infinite Tsukuyomi, Hanabi appeared alongside a still alive Neji in Hinata's dream world, spying on the latter and Naruto.

She become aunt of Hinata's children

The Last: Naruto the Movie
Two years after the events of the Fourth Shinobi World War, Hanabi is kidnapped by a mysterious man of the Ōtsutsuki lineage, having failed to capture Hinata. Naruto, Hinata, Sakura, Sai, and Shikamaru are deployed to go and get her back.

Trivia

 * Hanabi's name means "fireworks".
 * According to the databook(s):
 * Her favourite foods are bananas and milk, while her least favourite food is mitsuba.
 * Her hobby is training with her father.
 * Despite Kishimoto designing a post time-skip version of Hanabi only shown in Rock Lee no Seishun Full-Power Ninden spin-off, in Hinata's Infinite Tsukuyomi dream, she appeared in her Part I design.
 * As the younger sibling, there is a possibility she will be placed in the Branch Family and receive a cursed seal, once the next heir turns three. However, because her father felt that Hanabi was a more suitable heiress than Hinata, and because there have been several changes in the way the Hyūga family works, it is possible she might be exempt from this. Since she is a girl however, it is also possible she was never meant to have a cursed seal in the first place, as Japanese tradition usually only allows men to start a branch family.