I used to follow a manga with the main character a first year high school student who just ridiculously excels at everything, and I mean everything. From math to frog jump and handling bullies.
The character is tall with tidy short hair in formal style (like Sanji but black, no bangs and tidier). He wears glasses that he tends to fix gracefully or stylishly like how smart people usually are portrayed in manga, always dresses very neatly, and can run very fast and possibly almost fly. He doesn't talk much unless necessary, and he shows his thoughts through direct actions which most of the time are unpredictable.
The last part that I remember is that he was treated to be a servant by a bully gang leader of the upper year, but he was serving the bully too well, that the bully ended up looking up to him.