Congratulations. Your OC is 70% Mary-Sue/Gary-Stew. I hope you're happy. Although, you really shouldn't be. Now, I'm going to cut you some slack because you did come here for help...unless you didn't, and just came for fun and are now staring at the screen in astonishment, wondering how little Miss. Jennifer Alice Trisha Nina Elysia Elric Mustang Hohenheim or Mr. James Alfons Maes Alexander Elric Mustang Rockbell could possibly be construed as a Mary-Sue/Gary-Stew? Well, allow me to inform you. Chances are you made the massive mistake of thinking that mixing another bad-ass, spunky, fierce hero(ine) into the FMA world would spice things up a bit, and take some of the glory away from the main characters, to even things up. Sadly, you thought wrong. And the Mary-Sue/Gary-Stew that has taken the place of your OC is your eternal punishment. Enjoy it.
Why not tell me what you got? All you have to do is press that little button, right there. Right down there. You know the one. All input is appreciated! :)