Who is James Tremont (aka Juvenal Nyx) from Stories: All-New Tales and what is their importance?

James loses his identity in the beginning of this tale, renamed by the woman who calls herself Julia and inducts him as a child of the night. He spends more than twenty years following her example and living on the outside of humanity until he meets Iridia Lamone. Then, Juvenal decides to buck the trend and return to the land of the living as much as is possible. After saving her life, her mere presence is enough to return him to some semblance of humanity.