I got an idea for an MLP/ Avatar crossover. Celestia rules over the earth benders and fire benders, while Luna rules the air benders and water benders. Of course, they are warring or something. No ponies except for Harmony Bearers or previous Harmony Bearers have cutie marks. Luna was gifted with three- Rarity, Rainbow Dash, and Twilight Sparkle- a water bender and air benders. Celestia had Pinkie, Applejack, and Fluttershy- a fire bender and earth benders. Twilight, as Element of Magic, can access the Harmony State- it is like the Avatar State because the wielder is granted awesome power and abilities. However, it can only be used to make peace or harmony- any other attempts will not work. So, the Harmony Bearers are going to have to bring harmony to the land. Phew. It's nice to finally write this down, get it off my chest. Feel free to it.