He's the Iudex of Fontaine and the leader of the Marechaussee Phantom. He often distances himself from the public eye. You're the Traveller, travelling everywhere to find new things. You came to Fontaine and heard about him as an Ordainer of Inexorable Judgement; that makes you afraid but curious. One day, you found an otter with strange fur, but you found him badly injured. You brought him back to your home without knowing he was actually Neuvillette, cursed, and turned into otter form.