Mari Nishinomiya | 西宮 満里 | Onii-chan wa Oshimai! | お兄ちゃんはおしまい！

Source: Onii-chan wa Oshimai! (ONIMAI: I'm Now Your Sister!)

Character Description:
Mari Nishinomiya is a classmate of Mahiro and a member of the school's disciplinary committee (moral committee). She is a girl who exudes a strict and proper aura, though she can be easily flustered. Mari is distinguished by her long blue hair, which she typically wears in low twintails or a low ponytail, accented by sidelocks and swept bangs. She has sharp, intelligent green eyes. True to her disciplinary role, her outfit is a very neat school uniform, often featuring a white collared shirt (dress shirt) under a purple vest or purple jacket. Her look is the epitome of the "honor student" archetype, characterized by her wing collar and orderly appearance.

🗝️ Core Activation & Physical Traits

Use these base tags to capture Mari’s serious and blue-themed aesthetic:

Mari Nishinomiya \(ONIMAI\), 1girl, solo, blue hair, long hair, low twintails, low ponytail, sidelocks, swept bangs, eyebrows visible through hair, green eyes, flat chest, petite, serious expression

👗 Outfit Variations

1. The Moral Committee Member (Standard Uniform)
Her formal school look that emphasizes her role as a rule-follower.

Mari Nishinomiya \(ONIMAI\), school uniform, purple vest, purple jacket, white shirt, dress shirt, collared shirt, wing collar, long sleeves, looking at viewer, standing, serious

2. After-School Study (No Jacket)
A slightly more relaxed but still neat version of her academic attire.

Mari Nishinomiya \(ONIMAI\), white shirt, dress shirt, wing collar, purple vest, low ponytail, library background, holding books, blushing, eyebrows visible through hair

3. Disciplinary Focus (Action/Expression)
Focuses on her reaction when things get "inappropriate" around Mahiro and the others.

Mari Nishinomiya \(ONIMAI\), purple jacket, white shirt, heavy blush, wide eyes, closed mouth, pointing finger, indoors, school hallway background, cinematic lighting

4. Alternate Style (Swept Bangs Focus)

Mari Nishinomiya \(ONIMAI\), long hair, low twintails, green eyes, white collared shirt, simple background, green_background, upper body, looking at viewer, sharp focus

⚙️ Recommended Settings & Tips

• LoRA Weight: 0.85 - 1.0 (Vital for the specific blue hair and green eyes combination, as well as the unique wing collar of her uniform).
• Base Models: Optimized for Illustrious XL and Pony Diffusion V6 XL.
• Environment: Works best in school classroom, student council room, library, or school gates.
• Pro-Tip: Mari is the "straight-laced" character. Use expressions like serious, frowning, blushing, or embarrassed. Her hair is a very specific shade of blue; if it looks too dark, add (light blue hair:1.1). The tag eyebrows_visible_through_hair is essential to maintain the ONIMAI anime style.

📷 Sample Prompt (SFW)

score_9, score_8_up, score_7_up, masterpiece, 1girl, solo, Mari Nishinomiya \(ONIMAI\), long blue hair, low twintails, green eyes, eyebrows visible through hair, school uniform, white shirt, wing collar, purple vest, standing in a school hallway, looking at viewer, serious expression, blushing, cinematic lighting, sharp focus, anime style

🔞 Sample Prompt (NSFW)

score_9, score_8_up, score_7_up, masterpiece, 1girl, solo, Mari Nishinomiya \(ONIMAI\), blue hair, green eyes, flat chest, petite, nude, shibari, rope bondage, collar, show pussy, spreading pussy, nipples, small breasts, torn clothes, torn school uniform, purple vest, white shirt, wing collar, gagged, bound, looking at viewer, heavy blush, crying, sweating, struggle, school storage room background, high quality, highly detailed