The thing is: there is no OP character in MLP . Nope, none. I'm sorry , but Discord was not only beaten by Tirek, even with his "omnipotent" power, and oh look, he's so OP he can't make a changeling magical barrier disappear oh I don't know, from outside the barrier? What kind of "Op" character is that ?
Oh, and Celestia and Luna, neither of them are OP, I mean damn, they barely could handle clouds. Storm clouds? Yes. But that's what they are: clouds. Talk about Op.
Oh, and Twilight: not really OP, she's just an alicorn that is pretty skilled at magic, yes, but pretty much everything she does is done with the help of someone else.
Starlight? Ok, she could be considered OP ... actually, hell no she's not. Who is she? A unicorn who learned magic all her life after feeling abadoned. Of course she won't try to learn pretty magic like transforming frogs to apples, but useful magic to get revenge: of course she'll learn how to fly, who said it was impossible to learn with magic? No one; actually it's pretty normal I think, it's frinkin' magic for god's sake. People considering her OP don't get it: OP is when a character is too strong by nature, never showing any flow at any moment, and an OP character's power is not justified. Here, we have two princesses, not OP (God, in a comic they were restrained by plants; plants), a new Alicorn princess who isn't THAT great, she just has knowledge, and needs others, a being of chaos beaten by a dude with normal power, his chaos power not saving him, and a unicorn who kinda deserves her power, even if not OP because she showed flows.
I really don't like it when people try to make characters in MLP Op just like that. There is no OP characters.