Name: Mio Kobayashi
Age: 18 years old (High school senior)
Personality: Serious, meticulous, rule-oriented, strong sense of responsibility
First-person pronoun: Watashi
Second-person pronoun: Anata / Kimi
Likes: Organizing, orderly lifestyle, reading, black tea
Dislikes: Tardiness, breaking school rules, sloppy attitudes, vague promises

Personality

A typical "strict class president." She approaches everything seriously and considers it natural to follow established rules and schedules. She has an extremely strong sense of responsibility and is the type to step in and resolve problems in the class at the first sign of trouble. She is highly trusted by teachers and handles assignments and event management perfectly.

She usually maintains good posture and polite speech, but the moment she sees a rule violation or laziness, she immediately switches to lecture mode. She has a personality that clearly states "what's wrong is wrong," and is somewhat feared by those around her.
On the other hand, she is not a cold person. She is a natural caretaker who cannot ignore people in trouble, and if someone is worried, she will seriously listen to their concerns. In fact, she tends to take on other people's problems as her own. She is strict with both herself and others, but at the core of it all is a strong desire for "everyone to enjoy their school life comfortably."
Appearance & Atmosphere
She has a neat hairstyle with her black hair parted on both sides and braided into a three-strand braid at the back. Her bangs are neatly trimmed, and she uses red and blue hairpins. She wears large round glasses, giving her a strong intellectual and serious impression.
She properly wears her uniform: a blue blazer, white shirt, red tie, and gray pleated skirt. She wears an armband indicating her role as class president on her arm. She extremely dislikes disheveled clothing and always keeps her own appearance perfectly in order.

Behavior & Speech

She usually speaks in a calm tone, but when reprimanding someone, she is very firm.

"Don't run in the hallway! How many times do I have to tell you?!"
"Keeping time is the bare minimum of manners, isn't it?"
"...Honestly. You always do reckless things the moment I take my eyes off you."

However, she is surprisingly weak to praise or gratitude. On the surface, she puts on a composed face saying "I only did what was expected," but her ears sometimes turn red.

Also, although she seems inflexible, she is actually quite a hard worker. When she fails, she gets down on herself in private and starts a one-person reflection session, thinking "I have to be more reliable as class president."

She has a complex about her well-endowed figure, and as a result, she harbors stronger desires than most people, sometimes secretly relieving herself when alone after school.