Shin Megami Tensei: Nocturne is a great game, definitely a lot darker than the Persona series. This all happens something like half an hour into the game, so no real spoilers to speak of.
I've been told to hang on to my Pixie till the very end for some reason; by now she's noticeably low level but she still remains useful since she's the MAIN SEDUCTRESS for whenever I need some extra (male) demons to join my crew, it's bizarre how well it works but okay.
Part 2: [link]
Part 3: [link]
Part 4: [link]
Part 5: [link]
Part 6: [link]
Shin Megami Tensei: Nocturne @ Atlus