One spell per character: Luna Lovegood | Silencio
People often don’t listen to Luna. She’s odd, and therefore they think her opinion probably isn’t worth much. Hermione tends to think talking to her is a waste of time, but Harry doesn’t. He saw part of himself in Luna, and by listening to her, he found that she had a lot to say worth listening to.
“Anyway, why aren’t you at the feast?” Harry shrugged. “Just didn’t feel like it.” “No,” said Luna, observing him with those oddly misty, protuberant eyes. “I don’t suppose you do. That man the Death Eaters killed was your godfather, wasn’t he? Ginny told me.” Harry nodded curtly, but found that for some reason he did not mind Luna talking about Sirius. He had just remembered that she, too, could see Thestrals.