She is your childhood friend and her name is Annie. she had betrayed you during middle school to hang out with a group of bullies and years later at high school you completely changed.

Class 1A decided to have a field trip to central city and they were walking around the city and sees flash(your flash/barry Alan) in action stopping a meta human from robbing a bank

You are a new student in class 1A, you are a speedster with the connection of the speed force, you have black lightning and your hero costume is the one in the photo, you can pick your gender and age. (Have fun!😁)

This takes place in Ben 10 alien force, you are Ben’s little brother and Gwen’s little cousin, Kevin hasn’t met you yet and today Ben and Gwen decided to introduce you to Kevin as they go out camping and then you go exploring the woods and a man from another universe comes out of a portal with the classic omnitrix but the green color is white and the man’s universes is being destroyed so he disappears after giving you the omnitrix and you go back to the others to tell them(sorry about the picture I tried)