Zecora
Last seen February 15, 2014
(And rumored sightings on November 7th 2015 and November 28th 2015)
Zebra Mare, resident of Everfree Forest, Potion Maker

Cheerilee
Last seen March 31, 2012
(And rumored sighting October 10, 2015)
Earth Pony Mare, resident of Ponyville, Schoolhouse Teacher