Aoi is a central figure in the Wingman narrative, introduced as a mysterious girl who flees from a parallel dimension known as Podreams. She is the daughter of Dr. Lark, a scientist from that world who developed a powerful artifact called the Dream Note, a notebook with the ability to make anything written or drawn within its pages become a reality. When her home dimension is conquered by the tyrannical dictator Rimel, Aoi escapes with the Dream Note to the real world, specifically to Earth, in a desperate attempt to keep it out of the hands of evil. During her arrival, she inadvertently crosses paths with Kenta Hirono, a junior high school student obsessed with being a superhero.

Aoi is characterized by a sense of urgency and responsibility, driven by the need to save her world and her father from Rimel's rule. Despite the gravity of her mission, she is also depicted as a being of mystery and beauty, often causing a stir among those she meets. Her personality is serious and determined, but she is not without warmth, forming a close bond with Kenta and his friends as she comes to rely on them. She demonstrates a practical understanding of the Dream Note's power and its limitations, guiding Kenta as he learns to use it. Aoi is often the calm and knowledgeable presence in contrast to Kenta's more impulsive and enthusiastic nature.

Her primary motivation is to reclaim her home dimension of Podreams from the clutches of Rimel and to rescue her father, Dr. Lark. She seeks to use the Dream Note to achieve this goal, but its power is directly linked to Kenta after he unknowingly draws his original hero character, Wingman, within its pages. This forces a partnership where Kenta must become the real-life Wingman to fight the monsters and assassins Rimel sends after Aoi and the Dream Note. Her role in the story is that of the catalyst and the guide. She is the princess in need of aid, but she is also the one who possesses crucial knowledge about the Dream Note and the dimensional powers at play. She often supports Kenta in battle, using her own psychic abilities.

Aoi's key relationships are primarily with Kenta Hirono, who becomes her protector and the hero she needs to fulfill her mission. She comes to live at his home under the guise of being his cousin, leading to a complex and often comedic living situation. This proximity also creates a romantic subplot, as Kenta finds himself developing feelings for her, which complicates his existing affection for his classmate, Miku Ogawa. Her relationship with Miku is initially tense, marked by jealousy and misunderstanding, but evolves into a cooperative friendship as Miku becomes one of the Wing Girls who fight alongside Kenta. Her most significant off-screen relationship is with her father, Dr. Lark, whose fate is a major driving force for her actions throughout the series.

Throughout the story, Aoi undergoes development as she adapts to life in a world not her own and learns to trust and rely on others, particularly Kenta. She transitions from a lone fugitive to an integral member of a team dedicated to fighting for justice. Her character arc is intertwined with Kenta's growth as a hero, and she learns to balance her serious mission with the ordinary, and often chaotic, events of daily life in junior high school. Aoi possesses notable abilities stemming from her dimensional origin. She can use a form of psychic power called "dimension power," which she employs to support Kenta in his fights against the forces of Podreams. While she is not a frontline fighter like Wingman, her powers are crucial for defense and strategic support, making her an indispensable ally in the battle against Rimel.