General

Whitebeard's Tremor Tremor power

Yagami's power to kill people by seeing their face and writing down their name.

That skill Naruto does when he makes clones of himself. That would be so cool to do many things at once and hilarious to fool people haha!
ohh or on fruits basket, having a curse to transform into an animal.
Idk many skills. ._.

The Incarnation from Accel World.
It pretty much lets you do whatever you desire hard enough.

That power of the kings from Guilty Crown What's better than pulling DNA from people and using it as a weapon?
OR
Spiral Power from TTLG
OR
A combination of the sharingan eye, FMA alchemy, my two other choices, and the one guy from the familiar of zero's power to manifest any weapon and use it like a boss.
That would be epic o.o using the eye to cheat in math test, using DNA to make a pen when you drop it in math class, using alchemy to pass wood shop, using spiral power to turn my appendages into drills, or to combine my bike and my mom's van into some fighting robot, and use that uber weapon skill and go on a rampage.

I'm particularly fond of the power Ryner Lute from Legend of the Legendary Heroes. The ability to copy other abilities and use them at master proficiency is pretty sweet.

Edward's Alchemy.

Oban star racers: blue floaty dudes power to alter anything and everything to his will..

scarlet witch's ability to alter reality.

fire bending!

[b]BANKAI![/b]

hard to choose between Stands and Hamon/Ripple