The Phoenix~Pietro Maximoff

Viviana Heesters, a 20-year-old girl. Her parent's died in an explosion when she was 6. She was tossed in and out of foster homes. Then after coming to America, she meets Charles Xavier. He enrolled her at his school and taught her how to harness and control her mutant abilities. While at school, she earned the nickname 'The Phoenix' and met so many people like her. Once she was eighteen, she graduated the school and saw the avengers losing in the battle of New York, she meets her real father but she must defeat him because of his intentions. She helps the avengers win, and ultimately becomes part of the team.

Then while on a mission with the Avengers, she meets Pietro and Wanda Maximoff. Two people from her past. After years her emotions flare up causing some the of avengers to get injured but not enough to stop them from fighting. Viviana is scared. After all, she is slowly falling for Pietro, something she's stopped herself from doing to anyone because she's afraid of hurting them.

X-men X marvel