Rio Tsukatsuki

Rio Tsukatsuki is the president of Millennium Science School's Seminar and an administrator willing to make severe choices to prevent catastrophe in Blue Archive.

Rio Tsukatsuki and the crisis of Eridu

Rio is highly intelligent, calculating, and convinced that rational planning can control danger. Her secret construction of the city of Eridu and her conflict with Aris force her to confront the harm caused when responsibility becomes isolation and unilateral control.

Technology, control, and Rio's strained alliances

She relies on Millennium's technology, surveillance, and the support system linked to the AI Toki. Her relationships with Himari, Toki, and Aris reveal the tension between Rio's desire to protect Kivotos and her difficulty trusting others.