One possible fanfic could be where Wanda is on the bridge during a chaotic battle in 'Age of Ultron'. As she stands there, she realizes the danger she's in and decides to get off. She uses her powers to create a distraction among the enemy forces and then quickly makes her escape. Maybe she levitates herself down to safety, all while the battle rages on above her.
It could be a simple warning. Maybe there's a structural issue with the bridge in the fanfic's version of the 'Age of Ultron' world. Wanda, with her powers, might have sensed it and is telling people to get off.
Well, in a fanfic based on 'Age of Ultron' when Wanda says 'Get off the bridge', it could be a moment that is completely different from the movie. It could be that the bridge in the fanfic is a symbol of a crossroads in the story. Wanda's words could be the catalyst for a major plot twist. Maybe there is a hidden enemy on the bridge, or it could be that the bridge is about to be destroyed, and her words are the start of a rescue or escape sequence.
Steve Rogers could be an interesting pairing for Wanda. The contrast between his old - fashioned values and her more chaotic powers could create a lot of interesting storylines. They could learn from each other, with Steve teaching her about leadership and Wanda showing him the power of her unique abilities. Hawkeye could also be a good match. He has a family, and Wanda, who has lost so much, could find a sense of family and stability with him.
She could be in the middle of a psychic battle on the bridge. When she realizes she's losing control, she decides to get off the bridge to regroup. So she uses her telekinesis to push back the opposing forces briefly and then runs off the bridge. Once off, she finds a quiet place to regain her composure and strengthen her mental defenses for the next encounter.
It could be about Wanda having to make a quick escape from the bridge during the events of Age of Ultron. Maybe she's being chased by Ultron's minions and has to use her powers in a new and creative way to get off the bridge safely.
The Avengers would be devastated. Hawkeye, who has a sort of father - figure role in the group, might feel guilty for not being able to protect her. Captain America would be deeply affected as he values every member of the team. He would probably vow to make Ultron pay for her death. Iron Man, on the other hand, might blame himself for creating Ultron in the first place, which led to this situation.
One possible scenario could be that Wanda sacrifices herself to stop Ultron. Maybe she uses her powers to their extreme limit to destroy Ultron's mainframe, but in doing so, it drains her life force completely. Another could be that she is caught in the crossfire between the Avengers and Ultron's forces. With her powers being so powerful, she might be a prime target for Ultron's attacks, and the Avengers are unable to protect her in time.
You might try fanfic websites like Archive of Our Own (AO3) or Fanfiction.net. Just search for 'Age of Ultron Run Get Off the Bridge Wanda' on their search bars, and you may find the fanfic you're looking for.
To develop Wanda's character more, we can focus on her relationships. For example, her bond with Vision could be explored deeper. Show how they grow closer and how they influence each other's view of the world. Also, her relationship with the other Avengers, especially those who were initially skeptical of her like Stark. Have her earn their trust through acts of self - sacrifice and kindness.