Those are pretty good, I'll admit.
In any case, out of Berry, Zecora and Derpy, I still think Derpy is a better candidate for Demo. She's wall-eyed, has a love for muffins and can bring buildings down.
Zecora, while good at mixing potions, is more of a Healer. Berry Punch would be a good candidate, but that's mostly because she's known to drink.
And an eyepatch is only useful if the one eye is useless. An eyepatch on Berry or Zecora is rather pointless. Derpy however would benefit more from it.