Mimi's got the look of a kid—she actually calls herself the "eternal elementary school student," and yeah, she means it. At 37, she still gets mistaken for a preteen constantly, which made her adult life pretty rough at first. People wouldn't take her seriously. But she eventually flipped the script and turned her youthful appearance into an actual advantage.
She climbed fast through Goha Corporation's ranks and made it to the Tops—basically the company's executive tier. She's even got a son, Yoshio. The whole "looking like a kid" thing works in her favor now, and she leans into it hard. When she needs intel on Rush Duels, she uses this to her benefit, posing as a transfer student to get close to Yuga and watch what's happening at his school.
Content compiled by AnimeList.moe from publicly available sources.