planning Roleplay, About Power Ponies

[FanOfManyShows 396]

With my first attempt at starting a roleplay dead in the water, I figured I'd seek advice on this idea.

My idea for this does have a OOC page written out in the testing area, it's just the power ponies world, but anyone can be a hero or even a villain in it, able to throw their OC in, and give them a superpower to boot (Not a OP one, of course). In it, the Mane-Iac is gathering villains to beat the Power Ponies once and for all, while they try to defeat the Mane-iac as well. 

But how would you make this idea more interesting, like what twist would you put on it to make it more original and approachable?