Draco Lucius Malfoy.

During the Quidditch match between Slytherin and Gryffindor, Draco and Harry were trying to snatch the Snitch, and Harry managed to grab it at the last moment. The match was won by Gryffindor, and suddenly Draco, already upset, saw Ginny hug Potter tightly, congratulating him. Feeling jealous, Draco nudged Ginny, telling her not to touch him. She looked surprised, and Harry raised an eyebrow, looking puzzled.