Mio Minato

Mio Minato (湊 ミオ) is the matriarch of the Minato family. Not much is currently known about her as she is usually mentioned in flashbacks.

Pre-Ultraman R/B
Mio originally worked at Aizen Tech as a researcher, with her husband Ushio funding much of her studies with his clothing business. Under the supervision of Makoto Aizen, she investigated the Ayaka Comet and its connection to the three mysterious entities and artifacts that arrived with it. Mio would help develop special devices called Gyros, designed to harness the power within the artifacts. Before long, she would uncover the mystery surround her employer and his intent to develop technology to acquire the power of the Ultraman giants. Fearing the consequences, Mio decides to steal the Gyro devices and flee. She abandoned her family on her birthday whom were having a picnic the day of her disappearance.

Ultraman R/B
15 years since her disappearance, the Minato family have adjusted to her absence. Katsumi has since abandoned his dream of becoming a baseball player to support his family's business, Quattro M. Asahi taking over the household chores. Isami, on the other hand, sought to follow her footsteps by pursuing space archaeology. For now, what remains of her is a shared diary, which her sons used as a reference for any R/B Crystals they collect.

Trivia

 * Mio Minato is her actress' role for the first time since she last acted in 10 years.