Aoi Niina is a character from the anime Magical Girl Lyrical Nanoha EXCEEDS Gun Blaze Vengeance. She is a fourteen-year-old girl who stands 152 centimeters tall. Her physical appearance is noted for her long orange hair.

Aoi is a member of an organization known as the Majin Gari, which translates to Demon Hunters. Within this context, she is classified as a Majin ability user, a designation that speaks to her supernatural capabilities. Her skills are noted to be versatile, as she is effective not only in direct combat but also in infiltration missions.

In terms of personality, Aoi is characterized by a strong sense of competitiveness and a deep loyalty to her comrades. Despite being described as an outlaw, she is a girl who cares deeply for her friends and allies, suggesting a personality that balances a rebellious or rough exterior with a warm-hearted and principled interior.

Her role in the narrative is as one of the supporters of Towa Yorumi, a mysterious young woman who operates in the shadows of society. Alongside other characters such as Shiori Aizawa, Yuuna Kitamori, and Yuzu Kodera, Aoi functions as a backer to Towa, indicating that she is part of a close-knit group working towards a common goal, likely related to the central conflict involving demon hunting.