Hanabi Hyuga is Boruto's cousin and Hinata's younger sister. She serves as a mentor and a source of guidance for Boruto, especially when it comes to his training in the Hyuga clan's gentle fist techniques. Hanabi also supports Boruto in his growth and development as a shinobi, offering advice and assistance when needed. Additionally, she plays a role in helping him navigate his relationships with other members of the Hyuga clan and provides a different perspective on their family's history and traditions.