Appearances and characterization
Of all of the female characters in Daria, Angie might be the one most friendly with Brittany, a rare case of a main cast member having a strong friendship with a background character. In "Fat Like Me," Jane hypothetically asks Brittany what she would do if Angie cheated on her with Kevin. Brittany responds that Angie is her friend and that she would never do that.
Angie's role appears to be the breaker of bad news to Brittany. It is Angie's job to inform Brittany that her date, Robert, dances like a "geek." She tells Brittany (off-screen) that Kevin was "smiling (his) head off" at a lady customer purchasing nuts in "It Happened One Nut," which provokes an angry response and leads to Brittany confronting Kevin at the nut stand.
During "I Loathe a Parade," Angie is on a float with Kevin. She is wearing a sash marked "FOOTBALL SWEETHEART." When Kevin tries to come on to Angie, Angie replies that she's unhappy with how Kevin is acting -- and that Brittany, her friend, is right behind them.
When Brittany attempts to change her personality for a class assignment in "The F Word," Angie seems the most concerned about her, commenting that she's "lost her way" and "doesn't know who she is", and is the only one to argue that Lisa shouldn't be trying to replace the girl. Nevertheless, she reluctantly goes along with Lisa in (temporarily) kicking Brittany off the team and having Jane try out as her replacement. Brittany is reconciled with her fellow cheerleaders -- and Angie -- at the end of the episode.
Angie in Fanfiction
Angie is a recurring figure as she's one of the few non-Brittany cheerleaders we know the names of. Her personality and role varies, though she's usually presented as popular and (as in the show) buddies with Britt.
Angie sometimes surfaces as an antagonist. In the Turnabout Confusion series, she is part of the cheerleaders 'faction' following the lead of Dawn Wilkins in waging social warfare, and first to raise concern that Daria will become popular; she is increasingly worried by how far Dawn is taking things. In "God Save The Esteem" she represents the cheerleaders in a popular girls' cabal to stop Daria dating Tom Sloane; she is originally dating Mack but he breaks up with her when he finds out about this, which Angie takes pretty hard.
A larger role happened in 2018's "Second Chance for Love" by David Falkayn. In this story she secretly has geeky interests and is a closeted lesbian, but comes out to date Hungarian teenager Elizaveta Bathory. The story ends with them traveling through a portal into the Star Trek universe, where they join Starfleet.