Miyuri Tsujidou is a prominent supporting character in The Qwaser of Stigmata, serving as the daughter of the current dean of St. Mihailov Academy. Her father succeeded the previous dean, who was the father of Tomo Yamanobe, a transition that deeply influences her sense of entitlement and her antagonistic relationship with the series' protagonists. She is a young woman of eighteen with long pink hair typically styled with two red odango hair covers and dark reddish-pink eyes, and she is noted for her physical beauty and well-endowed figure. Her visual presentation aligns with her high-status persona and her desire to be the center of attention.

In terms of personality, Miyuri is defined by her arrogance, bossiness, and pride. She views herself as a central figure within the school and actively works to maintain that status, often bullying those she perceives as inferior or threatening to her social position, including Tomo Yamanobe and Mafuyu Oribe. She is frequently supported in these efforts by her close friend Hana Katsuragi. Despite her outward confidence, she is susceptible to flattery and manipulation, and her reliance on her father's authority and family wealth is a recurring point of contention. Characters such as Ekaterina Kurae exploit her vanity to steer her actions. Her motivation is largely driven by a need for validation and attention, and she becomes a comic relief figure after being humiliated by Sasha, who correctly identifies her as someone who relies on the power of others.

Miyuri's role in the story is primarily as a social antagonist within the school setting, providing a source of tension that grounds the narrative in the daily lives of the students at St. Mihailov Academy. She is not a combatant in the supernatural conflicts of the series and does not possess a Qwaser element or combat abilities. Her influence is derivative, stemming from her father's position rather than personal power. Her key relationships include her friendship with Hana Katsuragi, her rivalry with Tomo Yamanobe and Mafuyu Oribe, and her later association with Ekaterina Kurae, whom she welcomes and showers with expensive gifts as a form of revenge against Sasha. She also develops an affection for the character Elizabeth, whom she initially mistakes for a boy.

Her development is limited but notable. The most significant moment demonstrating her capacity for growth occurs when she strips naked in front of a group of terrorists to spare the same ordeal for Ekaterina, Mafuyu, and the others, suggesting that beneath her prideful exterior she does care for others, even those she bullies. This act of selflessness hints at a deeper sense of nobility that contrasts with her usual behavior. Overall, Miyuri Tsujidou functions as a foil to the more grounded protagonists, embodying the arrogance and social maneuvering of the "mean girl" archetype while occasionally revealing unexpected moments of humanity and growth.