old, and she considers Nightmare Moon her 'adoptive mother'. She was introduced to Celestia off screen. She was first found on the Moon by Nightmare, and she was taught by her. She is now 13, and she stays with Celestia and Luna. She (for some reason) stays as her filly-self, and she was taught to morph into anything(Such as Nightmare is able to do). She occasionally hangs out with The Mane 6, and she often learns lots from them. After Nightmare Moon suddenly got transformed back to Luna, Nightfilly somehow appeared in the same castle, and followed her.
Nightfilly is a, as her name suggests, a filly. She is about 9 years