Zim from "Invader Zim": A dark and twisted alien with a mission to conquer Earth.
Helga Pataki from "Hey Arnold!": A complex and emotionally troubled character with a dark and often misunderstood persona.
Angelica Pickles from "Rugrats": A manipulative and mean-spirited toddler who enjoys tormenting her younger peers.
Ren Höek from "The Ren & Stimpy Show": A mentally unstable and volatile chihuahua with a penchant for violence.
Invader Skoodge from "Invader Zim": A small and grotesque alien with a sadistic side, known for causing chaos.
Eliza Thornberry from "The Wild Thornberrys": A girl with the ability to talk to animals, often delving into the dark and dangerous aspects of nature.
Oblina from "Aaahh!!! Real Monsters": A monster who can shape-shift into various terrifying forms, often embracing the darker side of monsterhood.
The Gromble from "Aaahh!!! Real Monsters": A strict and imposing monster who teaches at the monster academy, often reveling in scaring and punishing his students.
Mr. Krabs from "SpongeBob SquarePants": A greedy and money-driven character who sometimes showcases dark and ruthless tendencies.
Rocko from "Rocko's Modern Life": A neurotic and perpetually unlucky wallaby, often facing absurd and dark situations in his everyday life.