Then if I was you watch up to the 4th season 2 part starting ep before jumping into what might be long term rps as unlike most cartoons for kids mlp;fim has character developing present albeit at times it seems to more or less vanish do to who worked and come season 5 works each ep (in afew cases eps) story bored and such. Where what I watched of the season 4 eps including the ones I haven't fully seen it seems a vast deal of development was kicked to the curb. But when I get around to watching season 4 I'm going to enjoy the Tirek part as it got some balls in season 4 when compared to prior seasons it even seemed we have some on the show staff that was a shonen anime fan I mean take this (don't watch the vid if you don't want major spoilers)
https://www.youtube.com/watch?v=Rs-dmlEDDkE really thats like dbz grade power play if you want to use a generic shonen thats well known to describe that scene.
Sorry I rambled ,have you read any of the MLP grimdarks or watch any of the more darker or atleast none family friendly vids people have made? If yes which ones? If you've watched any of the fanmade vids out there which ones?
I'm mainly asking for more info to see what I have to work with to kinda work up a adaptable set up for when you watch more of the series and sorry about spoiling season 3 ending for you on asking on the Alicorn or not question with Twilight