Name: Emerald Star
Age: 900
Species: Unitaur 
Gender: Female

Cutie Mark: A star with emeralds
Talent: Forging gems into weapons.

Bio:
Emerald Star is a pony who has 6 legs and is Tirek's daughter.  However, she didn't want anything to do with Tirek's plans for Equestria, so she spent a good deal of her life hiding underground from him.  After so many years of hiding, she met Princess Rock.  She explained her situation to Rock and she took her in.  She now rules the underground of Equestria alongside Princess Rock.

She likes gems, and due to their durability, uses them to create all sorts of weapons.

She is also the mother of Love Crest.