Just comment the pony you want to play as.

Mane 6:

Twilight Sparkle:

Rarity:

Applejack:

Fluttershy:

Pinkie Pie:

Rainbow Dash:

~~~

Royalty:

Celestia:

Luna:

Cadence:

Shining Armor (I count him):

Flurry Heart:

~~~~

Others:

Big Mac: 

Granny Smith:

Applebloom:

Sweetie Belle:

Scootaloo:

Spike:

Starlight Glimmer:

Sunburst:

Derpy:

Vinyl Scratch:

Octavia:

Lyra:

BonBon:

Thunder Lane:

Blossom Forth:

Rumble:

Babs Seed:

Cloud Chaser:

Pip:

Diamond Tiara:

Silver Spoon:

Snips:

Snails:

Bulk biceps:

Zecora:

Button Mash:

Cheerilee: 

Feather Weight:

Mr. Cake:

Mrs. Cake:

Pumpkin Cake:

Pound Cake:

Flash Century: 

Tree Hugger:

and many many more....