Possible future Soul Eater one shot for the (future) one shot fusion compilation: Incomplete Fusion · 5:43am Nov 5th, 2013
Unicorn ponies have active magic, and can therefore cast spells and master many different abilities if they so choose to. But, they are limited by their "font" or amount of mana they can carry within themselves. Twilight is an exception, and has an unusually large mana capacity, and combined with a thirst for knowledge, makes her a formidable mage. Main source of magic is focused around their horns.
Pegasi are more passive, but can manipulate air currents and weather patterns. Certain pegasi can generate clouds or thunder on a wind, or bend the air to allow them to move faster. Also cloudwalking. Magic is focused around their hooves and wings
Earth ponies are the most passive, yet theoretically have the largest mana capacity, the environment. They can use nature's energy to strengthen themselves, increase their stamina, and increase their durability. This extends to sicknesses, too. I think. They can also redirect some of the energy to encourage the growth of plant life.
So what if they worked together to combine their talents? Earth Ponies have power, Unicorns have versatility. The Earth Ponies could be Meisters, with the physical strength to keep up with opponents and parry their attacks. Unicorns could be Weapons, borrowing mana through the Earth pony to boost their own combat effectiveness. Pegasi are in between, and a number of them could either work alone (autonomous weapon) or be paired, like Liz and Patty.
Let the battles begin.
