Goth Girls Know Magic

Anime and Manga

 * Arachne from Soul Eater. A luxuriously gothic witch with eccentric tastes and lady-like mannerism. That and her spider-based magic adding a lovely dose of malevolence and creepiness to her true nature.

Film

 * Downplayed with Lydia in Beetlejuice, apparently being a Goth is enough to get around ghost' Invisible to Normals rule.

Western Animation

 * In one episode of Craig of the Creek, the main trio meets Tabitha and Courtney, two teenage goth girls who hang around their stump at night. The kids sees them lighting candles and reading tarot cards and jump to the conclusion they're witches. What's worse, one of the girls decides to mess with them and tells the kids they're cursed, which coincidentally proceeds the three of them having a chain of bad luck.