@Bolan
Actually, I have a different Idea. Twilight’s talent is magic. Trixie, Twilight’s rival, brags about her magic and thinks it makes her better than everypony else, but Twilight, despite having more powerful magic, is humble and doesn’t care about being the best. Rainbow dash and her rival, Lightning Dust, have the same goal and abilities(minus the Sonic Rainboom), but unlike Rainbow, Lightning doesn’t care who she hurts along the way. I can see a cruel, strict animal trainer being Fluttershy’s rival. Let’s say they’re training their animals to perform various tricks to entertain a crowd. Fluttershy’s animal friends would listen to her out of friendship and trust. The other character’s animals would obey them out of fear. Let’s say one of each group of animals messes up, causing both rehearsals to fail, badly, with the other character actually causing it by startling the animal. Fluttershy would make sure her friends are okay, and reassure the animal who tripped or whatever that it wasn’t their fault, these things just happen sometimes, and she believes they will be able to get the hang of it. The other one would yell at the animal who “caused” the accident and punish it, like giving it less food that night, or something. Noting that the others were not severely injured, they’d say something like, “Well? What are you standing around for? Get back to practicing!
NOW!” What do you think?