Hybrids!

They are trouble enough separate, but when the four hybrid girls get together, well, you're in for some real havoc.
Base by:

From right to left:
Brazen Alloy - Daughter of Iron Will and Zecora.
   Talents and hobbies include: pressuring people into buying things they don't want or need, potion brewing, growing flowers, emasculating men.
Huntress - Daughter of ahuizotl and Daring Doo
   Talents and hobbies include: giving relationship advice, charting people's relationships, scaring the living daylights out of children and boys, flirting, sharpening her nails, manipulating people, and blackmailing people
Purity - Daughter of Discord and Celestia
   Talents and hobbies include: sitting around, pulling pranks, practicing magic, making people question their decisions, and making people unsure and uncomfortable.
Bummble Bee - Daughter of Sonata and Flash
   Talents and hobbies include: being confused, chasing butterflies, collecting flowers, and watching the clouds.

P.S.
Bee is actually wearing a suit and tie, you just don't get to see the front.

Most of the hybrids get pointed ears and stuff to accent what would be an obvious physical difference in their pony form,
except bee because since Sonata looks like a normal human in EG I feel it is safe to assume the child of her and a normal person would also look normal.