Overview
Valerie Perez is a fictional character, a DC Comics supporting character and love interest for Bart Allen when Bart was the Flash.
Fictional character biography
The daughter of one of the enemies of the previous Flashes, Professor Manfred Mota, Valerie's life was saved from a riot at her high school by Bart Allen when he was Kid Flash. After being rescued, Valerie idolized the young hero and, being a scientific genius, devoted her life to studying the Speed Force and, in particular, Bart. After graduating from high school, Valerie worked for Tina McGee as a S.T.A.R. Labs intern at Keystone City and was in charge of working with Bart in sorting out what has changed in the Speed Force, after Bart refused to work with Tina. Managing to earn Bart's trust, the two kissed during a lab test.
Near that same time, Valerie's relationship to Mota was discovered by her employers, and despite Tina McGee's efforts, she was fired from her job at S.T.A.R. Labs. Mota called Valerie at her office, wanting to meet her, though she refused. Later, her father visited Valerie at her home, having somehow been transformed into an energy being, by reasons not yet explained. Leaving behind a fake Dear John letter for Bart Allen, that as expected prevented him from questioning Valerie's disappearance and search for her whereabouts, he took Valerie into an unknown location, hoping to use her DNA to restore his appearance, and use Valerie as a bait to take his vengeance on Bart, with Inertia's aid. Valerie survived the experimentation, and Inertia used her for a trap against Bart on Las Vegas after a phone call to him by disguising his voice with Valerie's.
Bart arrived to the penthouse of a Las Vegas hotel, only to find Inertia. Inertia then led Bart to Valerie, revealing that she was wired to a bomb. Faced with the classic choice of saving the girl he loves or Las Vegas, Bart deactivates the bomb and leads the bolt from the cannon around the world to destroy itself (arguably also the classic choice of a speedster). Inertia escaped and Bart, after aiding Las Vegas in recouping from the power loss of the cannon firing, returned to the penthouse to find Valerie. They rekindled their relationship there until morning.
From Wikipedia (CC BY-SA 4.0).