Miyako Saito is a major supporting character in Oshi no Ko. She is the current president of the talent agency Ichigo Production, which was originally called Strawberry Productions, and she becomes the adoptive mother of Aqua and Ruby Hoshino after the death of their biological mother, Ai Hoshino.

Introduced as the wife of the agency’s former president, Ichigo Saito, Miyako is initially portrayed as a shallow and self-centered woman. She married her husband largely for the chance to mingle with attractive actors, and she openly resents being tasked with caring for Ai’s secret twin babies. At first, she even considers selling the story of Ai’s pregnancy to a gossip magazine for money, but she is stopped when the twins—who can talk despite being infants—convince her that divine punishment will follow if she betrays them. This encounter marks the beginning of her transformation. She becomes a devoted caretaker, and over time her true nurturing nature emerges.

After Ai is murdered, Miyako formally adopts Aqua and Ruby. She grows into a caring, responsible, and empathetic mother figure, especially close with Ruby, whose dream of becoming an idol she wholeheartedly supports by lending the agency’s resources. She also helps Aqua process the trauma of losing his mother while supporting his ambitions in the entertainment industry. Her relationship with her husband, Ichigo, becomes more complicated after Ai’s death, but they maintain a partnership based on mutual respect.

Miyako’s motivations center on protecting Aqua and Ruby, keeping the secret of their parentage safe, and providing a stable home despite the chaos of the entertainment world. She demonstrates remarkable emotional intelligence, intuitively understanding the feelings of those around her and navigating difficult conversations with care. She is also perceptive—she is the first person to realize that Mem Cho is older than she claims, a detail that even Aqua misses. While she has no supernatural abilities, her adaptability and maternal instincts make her a vital emotional anchor in the story.

Professionally, Miyako proves herself capable by keeping Ichigo Production afloat through tough times, steering the agency in a new direction despite her lack of prior industry experience. Her character develops from a materialistic, impulsive woman into a hardworking, dedicated mother and business leader, embodying the realities and struggles of parenthood in a demanding environment. Her growth is closely tied to key events such as the adoption arc after Ai’s death and the challenges she faces as Aqua and Ruby pursue their careers in show business.