Hartley Sawyer

Reason Of Firing
The Arrowverse Star Hartley Sawyer was fired for Racial and Homophobic tweets Therefore that led to his departure from the Flash in 2020

Character
The former flash star played a character called Elongated Man and first appeared In Season 4 Episode 4 "Elongated Journey Into Night" in 2017 he was fired in 2020 which made his role last 3 years.