It's Levi-O-sa

“What happened down in the dungeons between you and Professor Quirrell is a complete secret, so, naturally the whole school knows.”
― J. K. Rowling, Harry Potter and the Sorcerer's Stone

“You haven't got a letter on yours," George observed. "I suppose she thinks you don't forget your name. But we're not stupid-we know we're called Gred and Forge.”
― J.K. Rowling, Harry Potter and the Sorcerer's Stone

“Dumbledore watched her fly away, and as her silvery glow faded he turned back to Snape, and his eyes were full of tears.
"After all this time?"
"Always," said Snape.”
― J.K. Rowling, Harry Potter and the Deathly Hallows

“Hello, Harry" said George, beaming at him. "We thought we heard your dulcet tones."
"You don't want to bottle up your anger like that, Harry, let it all out," said Fred, also beaming. "There might be a couple of people fifty miles away who didn't hear you.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix