Akane Kobayashi is a seven-year-old Japanese second-grader residing in Tokyo with her family. She has black hair typically styled in two buns secured with red bows and black eyes. As Yuuta Kobayashi's younger sister, she lives in the same household and interacts with video game characters that enter reality when her brother leaves his console running.

She actively participates during Dr. Wily's escapes from the game world. At Mount Fuji, she summons Proto Man and Beat against Lava Man and volcanic robots while Mega Man confronts Dr. Wily directly. She later aids in coordinating efforts to contain Dr. Wily's threats, including supporting the plan to return him to the video game world.

Her personality combines typical childhood interests with responsible actions. She expresses curiosity about playing her brother's Nintendo console but is consistently denied access. During crises, she demonstrates concern for others, urging Yuuta to prioritize assisting Mega Man over school obligations when immediate intervention is required. She mediates family conflicts, such as when Yuuta prioritizes gaming during New Year celebrations, leading to Mega Man's accidental transportation into reality.

She engages with Japanese cultural traditions throughout the story. During Obon, she takes Roll to experience wearing yukatas, playing Whac-A-Mole, watching fireworks, and promises Roll a kimono for Shichi-Go-San. She participates in New Year customs with her family and Mega Man, including receiving otoshidama. She observes Setsubun, Hinamatsuri, and Children's Day, flying koinobori flags for the latter.

Her practical skills include organizing resources to aid Mega Man, such as facilitating Eddie's delivery of energy replenishments. She displays athletic ability as a skilled soccer player. Her actions consistently contribute to resolving conflicts against Dr. Wily across multiple incidents.