As Ethel Muggs, Purser gets to play one of the most interesting members of the Riverdale crew. In season one, Ethel finds friendship with Betty and Veronica after being slut-shamed by Chuck. She becomes an official member of the gang after that, and is even invited to Jughead's birthday party. Things take a bit of a turn in season two though, as Ethel nurses a vendetta against Veronica and her family that leads to some underhanded maneuvers to make Veronica's life miserable.
Since Purser's characters tend to be lovable underdogs, it's exciting to see her take on a role that allows her to play a character with a little bit of a dark side.