Ms. Elaine
Spoiled Brat
A theory I got is Barry from E2 is Hunter Zolomon/Zoom. Zoom knows to much about E2 villians to be from E1. If the E2 Zolomons still wanted to adopt a child, it could be Barry. One thought that has crossed my mind all season was with the slight variations of event in E2, what if Barry's pops did kill Nora and Barry witnessed it in E2. If the E2 West's family stays together, they dont have space for Barry to move in. Barry gets adopted by the Zolomons, takes their name to move on, and grows up on path without Joe's guidance and need to solve his mothers murder.
No, he's just a regular dude. The producers and actor have already confirmed this. Scratch E2 Barry out of your theories.