Nope she's not original, Phi just loves those games so much. Doesn't help that there's not a lot of fan art of her either, the series itself is just so obscure, especially since it's a visual novel that isn't Ace Attorney or the Fate games, and the games are so oddly named too you wouldn't have any idea they are connected unless you are a fan, or in this case know one. The first game was called 9 Hours, 9 Persons, 9 Doors, or 999, the second is afore mentioned Virtue's Last Reward, or VLR, and the one they are making is called Zero Time Dilemma. Plot is complicated as hell too, for good reason mind you.
Heck I didn't even know that they went from 2D portraits to 3D models from the first to the second game until we debated about the color of Phi's jacket thing. Point is he loves this series about as much as you gush about FF14.