Nero dresses in a brown suit with a necktie patterned with pictures of snails. In "The Austere Academy", his hair is tied into four pigtails, but by "The Penultimate Peril", they have grown into four long braids that dangle behind him. Nero often mimics what others have just said in a high, mocking tone and has numerous strict and unusual punishments for his students, especially if they miss his violin performances where those who miss it must buy a bag of candy and watch Nero eat the whole bag.