Board Thread:General Discussion/@comment-11518342-20140308201629/@comment-10529728-20140309203841

They're called side characters... lol. And you're still in the show. Think of it like My Little Pony

There's 6 main ponies

Twilight, Pinkie, Rainbowdash, Fluttershy, Rarity, & Applejack

Then there's all the side characters

Derpy, Scootaloo, Bon bon, Lyra, Celestia, Luna, Vinyl, Sweetiebell, Yeah you get it lol

So everyone's still in the show, just most likely not EVERY episode.