Marcus Flint

You gave Mr. Malfoy quite a fright, said Lupin.

Harry stared, lying in a crumpled heap on the ground where Malfoy, Crabbe, and Goyle, and Marcus Flint, the Slytherin team captain, all struggling to remove themselves from long, black hooded robes.

It looked as though Malfoy had been standing on Goyle's shoulders.

Standing over them with an expression of utmost fury on a face was Professor McGonagall.

Josephina Flint was Minister for Magic in the 1800s.

But by the modern era, the family is best represented by Marcus Flint, the captain of the Slytherin Quidditch team.

Right.

His entire approach to the game, and by extension the family's approach to their status, is sheer unpolished brute force.

It is pure visual spectacle and absolute unpunished lawlessness.

We literally watch Marcus Flint, the opposing team captain, violently kick a Gryffindor player.

We see another Slytherin player straight-up punch an opponent in the face.

Yeah.

In the text, hitting the keeper is a severe illegal penalty.

Yes.

When Marcus Flint illegally blocks the protagonist during a dive for the Snitch, the whistle is instantly blown.

Madam Hooch screams at him.