Friendship is Dragons

Things The Mane Six Are No Longer Allowed To Do In An RPG
Rainbow Dash: ...and then I made a huge RAINBOWSPLOSION and the awesome radiation gave us all our cutie marks and hatched Spike and now it's my signature move and it hits everything with fire damage because it's like a 7 kajillion on the Scoville scale and...
1. Inserting yourself into other players's backstories.
Pinkie Pie: OOOOH!! What's this guy's name?
DM: I dunno, Cranky? It doesn't matt-
Pinkie Pie: What's he up to?
DM: He moved to town? Look, you're supposed to-
Pinkie Pie: I wanna go visit his house!
DM: Y'know what, fine. Another story arc wasted...
2. Derailing campaigns to focus on irrelevant NPCs.
FX: (CRIT FAIL!)
3. Splitting the party in hostile territory.
Rarity: Well if I wasn't supposed to enter the competition, then why did Twilight's library have a wing spell? It's not like Twilight would want wings. She has a balloon.
4. Stealing questlines from other players.
Fluttershy: I roll to Intimidate and attack.
Pinkie Pie: It's a CIVILIAN. Why are you attacking a civilian?
Fluttershy: He got in my way.
5. Rolling Intimidation against random NPCs.
6. Attemping to solo a 6-player campaign.