Osana Najimi from Komi Can't Communicate.
Trained mostly on anime screenshots, so gens look like anime screenshots by default. Which is kinda cool I guess, but it also works very well with style loras.
Character is androgynous but you can add gender tags to taste.
Trigger: osananajimi
Support tags: brown eyes, flat chest
Suggested negatives: wide-eyed (character canonically has wide eyes/small iris, negate this for a more generalized style)
School uniform: school uniform, blazer, striped necktie, black thighhighs, uwabaki, striped skirt