Mika Okamura is a supporting character in the anime television series Alice Gear Aegis Expansion, which aired in 2023. She is 24 years old and stands 1.58 meters tall. She has dark ochre hair cut to neck length and grey eyes. Her primary role within the story is as a member of the maintenance staff, known in Japanese as seibibuin, at the Narikozaka Manufacturing company.

Mika possesses a strong and experienced personality. She has been with Narikozaka since its earlier, more prosperous days, which has given her a veteran's level of skill and confidence in her work. This background makes her a reliable and capable figure within the team, though she can come across as stubborn and is easily prone to anger. Despite this outwardly prickly demeanor, she hides a more caring and dedicated side, especially when it comes to her responsibilities and the people she works with.

Her motivations are closely tied to her sense of duty and her knowledge of the company's past. She is fiercely committed to her role and takes pride in maintaining the equipment, likely seeing her work as a vital, behind-the-scenes contribution to the fight against the alien Vice. As one of the few people who knows about Narikozaka's history, she keeps this information to herself for much of the story, adding an element of quiet loyalty and protectiveness to her character. Within the narrative, she serves as a grounding presence, representing the experienced, blue-collar side of the operation that supports the younger frontline actresses. Her role centers on the daily life of the maintenance crew, highlighting their importance to the larger mission. Her notable abilities are rooted in her technical expertise, allowing her to keep the Alice Gear mecha operational and in peak condition. Her character development often revolves around her interactions with the younger staff and actresses, gradually revealing the depth of her dedication and the reasons behind her guarded nature.