Usually when you watch a cartoon you'll spot numerous 'background characters.' They for the most part don't get any lines and are just there to say people (or animals) are walking about. That doesn't apply to My Little Pony: Friendship is Magic. Yup, a lot of these background characters actually do get lines and, get this, become fan favorites. Here I list what I think are the top 4 best of the bunch, but they're all cool in the end.
Lyra may have one of the greatest names of the entire series. She is easily one of the most recognizable background Ponies, thanks to her unique misty green color and Lyre Cutie Mark. She also has the honor of being in the center of the mind-controlled Bridesmaids.
Bon Bon might just be the most recognizable background Pony, thanks to her curly mane and colors. I wouldn't be surprised if she appeared in almost every episode. She's always there in the background, whether she be walking or hanging out with Lyra. Now what puts her ahead of Lyra besides being more recognizable are her appearances in The Last Roundup. When Applejack is departing, she is the only background Pony there seeing her off, everyone else is Mane 6 and family. Then in the surprise party, she's the only non-Mane 6/family member there, that's pretty cool, that must mean she's good friends with Applejack. Her and Lyra are best pals in the show.
Amethyst appears throughout the show. Yes, she is a color palette swap of Lyra, but do you know why I rank her so high? Her only speaking role is in The Mysterious Mare Do Well, and she's awesome in it. Her voice is awesome, her attitude against Rainbow Dash is awesome, she is awesome.
Like a boss.
And finally the one and only...
Were you expecting someone else? Of course not! It all started with a simple error on a gray Pegasus, that error transformed her into the fan favorite background Pony. She has quite a few appearances throughout the show, (even taking on the mayor!) you can always tell by her yellow spiky hair and of course her derped eyes. It wasn't until The Last Roundup where she got her a speaking role, which erupted into a controversy. Still, there's no denying that Derpy is the greatest background character ever.