Invader Zim

Gaz is Dib's younger sister, known for her sarcastic attitude and disdain for anything that doesn't interest her, such as her brother's behavior. She's a quiet and serious girl with a knack for video games, especially "Everybody Dies." Despite being intelligent, she's apathetic toward Dib's paranormal investigations and even mocks him for his efforts. Her personality is somewhat distant, but she has a strong sense of independence and is quite capable of taking care of herself. She's also rather temperamental and doesn't hesitate to stand up to those who bother her, such as when she hits Dib or shows disinterest in situations involving him.

Gir is Zim's robot, with an eccentric and comical personality. He looks like a small robot with a large head and disguises himself as a dog in several episodes. Although originally created to help Zim in his mission to conquer Earth, Gir is completely useless and often causes chaos due to his erratic behavior and love of simple things, like food and fun. He is very loyal to Zim, even though he is a total disaster and not very capable of performing serious tasks. Despite his clumsiness, Gir is a beloved character for his goofy and cheerful personality.

Twelve-year-old Dib looks very much like his father, Professor Membrane, with black hair and a similar haircut. His hair has a solid spike that doesn't change shape even when he gets wet from a giant water balloon. He wears a black jacket, a blue T-shirt with a gray face on it, black pants and boots, and glasses that reveal his amber eyes.

Dib is intelligent, determined, and persistent in his pursuit of the paranormal, despite being ignored by his classmates and family. While it's unclear if he hates all aliens, he confronts those who threaten Earth, such as Zim, Tak, and Tenn. He is capable of hacking alien technology and building useful devices. Throughout the series, his personality evolves from desperate to more fun-loving and tolerable. He is also a fan of the show "Mysterious Mysteries," and in one episode, he attempts to prove that Zim is an alien, but his theory is rejected.

Zim is an Irken alien sent to Earth on a mission to conquer it, though he is completely incompetent and is often ridiculed for his failures. He is ambitious, but his arrogance and lack of skills frequently land him in comical and desperate situations. His appearance is distinctive, with green skin, large eyes, and an antenna on his head. Despite his failures, Zim refuses to give up and is always looking for ways to prove himself to his race. He is very obsessive about his mission, but he doesn't understand humans or Earth well, which only makes him more inept. His relationship with Dib is fraught, as Dib tries to expose him as an alien, while Zim considers Dib a ridiculous enemy.