Ember

Ember Blaire was taken by Hydra at the age of 6 after her parents were murdered. Hydra had been trying to salvage what was left of the extremis project created by Dr. Killian Altridge, and managed to recreate the serum, mixing it with the one they used to control their soldiers. After being formed into one of the most dangerous Hydra Assassins in history, she's rescued by none other than Steve Rogers.

Ember is than thrust into the world of heroes, something completely foreign to her. There she changes her life as much as possible, even meeting someone who teaches her something she never knew was possible. Love.
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"You don't understand. The term hero isn't even in my vocabulary, how can you be so sure that I'll be able to even help you." I said almost emotionless
He took my hand in his, his eyes held an emotion I couldn't quite understand. My eyebrows raised in confusion.

"I don't think I've ever been more sure of anything in my life. Your still learning but you've already helped so much, and together we can do anything."