Koto Amatsukami. It's ultimate persuasion, which is absolute super power, as I can literally convert any intelligent creature into the way of thinking I want. You can take over the wolrd with that without people even realizing that there's something wrong with that.. Do time limitations apply though? Because then it's worthless.
Official Lightning's shorts of this board. Official Selphie's panties of every board!!!
Shadow Clones. The most practical one. Imagine everything you could do in such a short time. Whenever you need a sparring partner? You got one. Need someone to play versus or co-op with? You got someone. Need someone to do homework while you play videogames and get all the experience from each for half the work? You do dat. Wanna sleep in, but have to go to work or school? Go, clones go!
"If you will not listen to reason, then listen to my fists!" "You were always a brother... Never an enemy."