Nixie is number one for me, she (I assume) is a recolour of Trixie that appears in Bridle Gossip from a sky view she is behind a (4 Trixie's appear scattered around the place) Trixie, and she is extremely obscured, here is the only known picture of Nixie 
Nixie ID S1E09

2 Berryshine's :D Nixie is behind Trixie.