Rosso

Mr. Rosso is a jolly man with good humor. He always puts five sugars in his coffee, and loves to see Anna's smile as he does that. He loves movies and regrets not having enough free time to watch them when he was younger. Among his favorites is a film entitled "Summertime," which always makes him teary-eyed. In the anime, he's actually retired mafia hitman, aliased as the "Ghost" in Nina's professor's study of three murder cases (Source: Wikipedia)