Here are some powers you can choose from, note that I do not include cliches.
Any elemental power: Fire, Water, Ice, etc.
Ace Skill: Archery, Sword fighting, Summoning, etc.
or It can just be something a bit overpowered*: Time Traveling, Invincibility, etc.
*Note: These are limited powers, meaning that if you choose it as a power, it has a time limit on how long you can keep it up.
Use your brain, choose your power.