- Voice Actor (CV)
- Marina Inoue
- Gender
- Female
- Role
- Supporting
- Identity
- A third-year student at National Magic University First High School, former Disciplinary Committee Chairman, one of the school's legendary 'Big Three' alongside Mayumi and Katsuto, and eldest daughter of the Watanabe family
Personality
Resolute
Discipline-oriented
Strong sense of justice
Mentoring spirit
Mari Watanabe stands as one of First High School's most formidable figures, having served as the head of the Disciplinary Committee before passing the torch to her successors. Her combat style is distinctively her own, blending chemical agents with magical techniques to create a highly effective approach to close-quarters magical combat. While her leadership demeanor is strict and uncompromising, she harbors a genuine warmth toward those she mentors. Throughout multiple campus crises, her calm and decisive command has proven invaluable—making her one of Tatsuya Shiba's most steadfast allies within the school.