Almost There

The following are goth girls from animated shorts/pilots that were collected in animation showcases like Random! Cartoons. Too bad they're just "one-shot" cartoons and were never given their own series.
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Lacey Shadows from The Modifyers. She only appeared in the pilot because the cartoon had never been green-lighted by Nickelodeon. It's too bad because the setting is Steampunk. It's a very rare yet amazing theme. And the art in the show is just as gothic and beautiful. Lacey works for the creepy Baron Vain (lives under a cemetery) in stealing precious artifacts and she's his favorite. Her teammate is a no good rat named Runt. But actually, goth Lacey Shadows is preppy Agent Xero (reminds me of Ami from Hi Hi Puffy Ami Yumi). She's a master of disguise and together with her modular partner Molly, a part of a secret mystery cracking team known as The Modifyers. She only disguised herself as Lacey Shadows to foil the evil plans of Baron Vain.
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Rosemary from Kyle + Rosemary. It's about teenage romance that started in the online game Quest World. Kyle is a geek and played a knight who fell in love with a dark sorceress named Lunarella. She's actually Rosemary, a member of the goth group. Though she has friends, Rosemary still feels alone and different. But when she's in Quest World, she's free and can be her real self. Since the geeks and goths hate each other, Kyle and Rosemary only meet in Quest World. It was Rosemary who first found Kyle's real geek identity. But even so, she still likes him and soon told him the truth. And at prom night, Kyle dressed up as a goth while Rosemary dressed like a normal girl (she's a brunette actually). This shocked their friends, but even so, the two walked under the stars.
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Tess from Girls on the Go. This is also a cartoon about teenage love. But the protagonist is Kat while Tess is her goth best friend who taught her rules how to date a guy. Kat found a love note signed by Spencer who, according to Tess, is the classiest and handsomest guy in school. But he turned out to be this pudgy, gross guy. In the end, it was Tess who became his girlfriend and Kat found the real handsome Spencer. What's cool about Tess is she sleeps upside down on a tree with her pet bat. She also created a love potion made from toenails. And the creator, Aliki Theofilopoulos, voiced Crimson, the other goth girl in "Kyle + Rosemary".
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Gloom from Sparkles and Gloom. Set in a fairytale world where goody cutesy things live together with the dark forces of evil. Sparkles and Gloom are the daughters of Prince Charming and the Evil Witch. They both attend Geevil School where sparkly pink, and grim gloomy creatures are encouraged to be friends. But chaos usually happens especially between Sparkles and Gloom. In the episode, they quarreled so badly that their powers were switched. Because of this, Gloom was forced to join the puffy ballet group for the talent show. While Sparkles had gone goth and joined Gloom's boney rock band.
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Anemia from Anemia and Iodine. The show is from KaBlam! I put her here coz KaBlam! is an old Nickelodeon show that features one-time shorts, too. Anemia is a goth girl cat who loves the mystical and supernatural. Her room is full of books and potions, and a skull named Muriel. Anemia's best friend is a skater girl named Iodine. In the episode, they went to Malaria Manor to conduct a seance and free the cat ghost that haunts it.
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Selina Kyle (Catwoman) from Gotham High. We all love Batman for the dark super villainesses like the perky freak Harley Quinn, the seductive Poison Ivy and of course, the catastrophic Catwoman. But I do believe their alter egos are not goths, even if they live in a city with a "goth" in its name. 

But there is a show (well, almost a show) where they can be. Gotham High is created by Jeffrey Thomas and Celeste Green. It's set in an alternative world where Bruce Wayne is a teenager and also are his classic villains. They still keep their powers and personalities, and they each represent different high school stereotypes. As for Catwoman, she's the stereotypical femme fatale goth girl who tempts Bruce for some trouble. Pamela Isley (Poison Ivy) looks like the sexy and shallow popular girl in a goth get-up. While Harley Quinn is a preppy goth cheerleader. Yeay! Too bad, the project was never continued. Only concept arts are what's left of this wonderful idea. See more of them in Jeff and Celeste's official blog.