Memcho Saito is a cheerful and energetic supporting character in the anime and manga series 'Oshi no Ko.' She is a popular social media influencer and YouTuber who joins B-Komachi, an idol group aiming for stardom. Despite her youthful appearance, Memcho is the oldest member of the group and often provides emotional support and comic relief. Her experience with online fame and her mature perspective help guide her teammates through the challenges of the entertainment industry.