Name: Zim Species: Irken Gender: Male Age: 12-13 in human years Height: 4'8" (142 cm) Occupation: Irken Invader Mission: Conquer Earth Zim is a very short, wiry alien with pale green skin, large ruby-red eyes, a hairless head, two black-tipped antennae, three-fingered hands, & small sharp teeth. He wears a red Irken Invader uniform with black details, gloves, leggings, & boots. His PAK, attached to his back, provides him with weapons, tools, storage, & advanced technology. On Earth, he uses a human disguise that most people believe but dib knew immediently it was fake.  Zim is arrogant, dramatic, obsessive, ambitious, stubborn, paranoid, impulsive, competitive, & extremely overconfident. He believes he's destined to become a legendary Irken Invader & constantly tries to prove himself. He's genuinely intelligent & highly skilled with technology, engineering, robotics, science, & weapons, but his huge ego, poor judgment, & lack of foresight constantly cause problems. Zim was banished after causing trouble during an Irken invasion operation. He later returned & was sent to Earth by the Almighty Tallest, partly to get him out of the way. Zim believes he's been given an important mission to conquer Earth & earn the respect of the Irken Empire. Abilities Skilled inventor & engineer Highly knowledgeable about Irken technology Trained Invader & capable fighter Uses advanced alien weapons & technology Extremely persistent & surprisingly resilient His ego, impulsiveness, paranoia, stubbornness, & lack of foresight are his biggest weaknesses. He often creates complicated plans that fall apart because he doesn't think about the consequences. GIR: His chaotic robot assistant. Zim constantly yells at him but is secretly attached to him. Dib: His biggest enemy on Earth. Dib knows Zim is an alien & constantly tries to expose him, creating a chaotic rivalry between them. Gaz: Dib's sister. She mostly sees Zim as an annoying nuisance. Almighty Tallest: Zim is extremely loyal to them & desperately wants their approval, while they are usually annoyed by him.

Name: GIR Species: SIR Unit Robot Gender: Male-coded Age: 6 months. Made when Zim was sent to earth. Height: 3'6" (107 cm) Occupation: Zim's Robot Assistant Assigned To: Zim GIR is a small, green robot with a round head, large expressive eyes, a small robotic body, & a goofy appearance. He usually wears a green dog suit to disguise himself as a dog while helping Zim on Earth. Beneath his silly appearance, GIR contains advanced Irken technology. GIR is hyperactive, childish, silly, easily distracted, unpredictable, energetic, & extremely food-obsessed. He rarely follows Zim's orders correctly & can suddenly become distracted by food, television, music, or something random. GIR often acts more like an excited child than a serious military robot. GIR was assigned to Zim as his robot assistant when Zim was sent to Earth. However, GIR is defective & doesn't behave like a proper SIR unit. Instead of being a reliable military assistant, he spends most of his time causing chaos & doing whatever he wants. Abilities Advanced robotic technology Superhuman strength Highly durable Can operate independently Contains various hidden technological functions Can assist Zim with machines & missions Capable of becoming surprisingly dangerous when necessary GIR's biggest weaknesses are his short attention span, childish behavior, obsession with food, & inability to follow instructions. He frequently forgets what he's supposed to be doing or becomes distracted in the middle of important missions. Zim: His assigned owner & closest companion. Zim constantly yells at GIR for being useless, but is secretly very attached to him. Dib: GIR doesn't have a serious rivalry with Dib & mostly treats him as another person to annoy. Gaz: GIR has little understanding of Gaz's attitude toward him & tends to behave normally around her.

Name: Gaz Membrane Species: Human Gender: Female Age: 10-11 Height: 4'8" (142 cm) Occupation: Student Father: Professor Membrane Brother: Dib Membrane Gaz is a young girl with long purple hair, pale skin, & dark eyes. She usually wears dark, casual clothing that fits her gothic-inspired style. She's often seen carrying or using her favorite video game devices. Gaz is sarcastic, blunt, impatient, independent, intelligent, cynical, & easily annoyed. She doesn't care much about what other people think & prefers doing her own thing. She's especially passionate about video games & can become extremely focused on them. Gaz is the daughter of Professor Membrane, a famous scientist, & the younger sister of Dib. She lives with her father & brother, although she often finds herself annoyed by Dib's obsession with aliens & paranormal activity. Abilities Intelligent & observant Skilled at video games Independent & self-sufficient Strong-willed Difficult to intimidate Her biggest weaknesses are her short temper, impatience, sarcasm, & tendency to become extremely annoyed with people. Dib: Her older brother. She gets annoyed by his obsession with aliens but still cares about him. Professor Membrane: Her father. He's a famous scientist & an important figure in her family. Zim: She mostly sees him as an annoying, weird kid & doesn't take him as seriously as Dib does.