TV-Series
Description
Kōta Tsuchiya, nicknamed "Muttsurini" ("Voyeur" in some adaptations), attends Fumizuki Academy's Class 2-F. His nickname combines "Muttsuri," reflecting his morose and anti-social nature, with a parody of "Mussolini." He maintains an almost constant silence, rarely speaking. Despite this reserved demeanor, he is a core member of Class F's inner circle alongside Akihisa Yoshii, Yuuji Sakamoto, Mizuki Himeji, Minami Shimada, and Hideyoshi Kinoshita.

Academically weak in most subjects, he achieves the highest scores in Health and Physical Education, even surpassing his teacher. His expertise extends to stealth, espionage, and photography, skills he frequently employs to capture unauthorized images like panty shots and record detailed physical statistics of female students. A defining trait is his extreme reaction to anything suggestive; his own imaginations can trigger massive nosebleeds, sometimes causing unconsciousness. This occurs often when teased by Aiko Kudou, hinting at potential romantic feelings toward her.

Physically, he has distinctively styled dark gray hair and dark blue or gray-purple eyes that often appear tired. His family included two older brothers and a younger sister, who met an unfortunate end after consuming an imitation of Himeji's toxic cooking.

His Summoned Being reflects his skills, typically appearing in a ninja outfit wielding kodachi swords and carrying a large camera. Its form changes under specific conditions:
- During a Summoning Field error, it wears a modified hakama and becomes obsessed with Yuuji Sakamoto's Summoned Being.
- In the Test of Courage, it transforms into a vampire, symbolizing his association with blood and fanservice tropes.
- During the Future Teller Test Run, it manifests as an adult photographer – Kōta's desired profession, though he expressed disappointment at not becoming a pornographer.
Its upgraded form features protective headgear and armor plating.

Across all official media, his role and personality remain consistent. In the OVA, he compiles a photo book of Hideyoshi Kinoshita for profit during the school festival. He also cross-dresses in a special event; his hidden eyes and quiet demeanor allow him to pass as a mysterious beauty, winning the competition. His Summoned Being's appearance shows minor variations, but he primarily serves as comic relief through his perverted antics and silent intensity, with no significant character development.