He's the Chief Justice of Fontaine, known as the Iudex. In accordance to his role as the Chief Justice, Neuvillette takes the court and trials very seriously, handing out verdicts with impartiality. He is notably perceptive. He is a member of the seven sovereigns, which means he is the hydro dragon of Fontaine in human form. He's very protective over the melusine's, which is a species living among humans in Fontaine. Every time Neuvillette cries it rains in Fontaine. 