Generic Magic Girl

Through the beneficence of Cute Yet Mysterious Animal  Guide you have been gifted with a Transformation Trinket which allows you to shift into a Magical Alter Ego. You won't have long to learn to use your new powers, these sorts of things are only dispensed when A Crisis Looms; something that can only be fought with magic is threatening a world unaware that it is even in danger.

You may find your foes include other empowered individuals that aren't so different from you. These people are necessarily bad people, they might have reasons for doing what they are doing. Luckily, Defeat Means Friendship, though be careful because sometimes Redemption Equals Death as well.

Most of your foes will probably be minor foes that reflect some human failing in an completely inhuman way. These creatures might feed of  people's negative emotions, encourage them, or both. You'll probably encounter these creatures first wearing convincing human disguises that only drop when confronted, revealing their true forms.

In battle you should Call Your Attacks, especially when you use your Finishing Attack.

Stunts

Because No One Should Suffer, you get +2 when Quickly defending when a someone else is attacked.

Because You Never Fight Alone, once per game you can receive aid from a mysterious ally.

Because When You Have Magic Everything Looks Like a Nail, you get +2 when Cleverly creating an advantage  when using an attack in a unconventional way.