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Characters: Invader ZIM
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Main Characters

Voiced by: Billy West (pilot only) Richard Steven Horvitz (series)

"I am Zim, and Zim shall rule!"

A pint-sized alien from the planet Irk, with an ego as big as he himself... isn't, Zim is a walking disaster area that somehow remains oblivious to his own shortcomings and the contempt his people hold him in. He thinks he was sent to Earth as an Invader to ready the planet for hostile takeover, but really his leaders were just trying to get rid of him by sending him as far away as possible (they didn't even know there'd be a planet there for him to try to conquer). On Earth, he aims to Take Over the World, but is of course continually thwarted, through Dib's interference, GIR's stupidity, or sheer bad luck, but often as not Zim's greatest obstacle to success is himself.

Voiced by: Rosearik Rikki Simons

"I like waffles!"

Zim's robot sidekick, on Earth disguised as a dog. Supposedly a "SIR" (Standard-Issue Information Retrieval) unit assigned to all invaders, but GIR is an "advanced" model the Tallest specially gave Zim. And by "advanced", we of course mean "moronic," thanks to having a head literally full of garbage.note  While usually too flighty to be of any consistent help, GIR will now and again go into "Duty Mode," signified by a change of eye-and-panel color from blue to red, and act like a real SIR.

Voiced by: Andy Berman

"My problem is that the human race seems to want to be destroyed!"

An eleven-year-old (or thereabouts) self-styled "paranormal investigator", and one of only two people on Earth (the other being his sister Gaz) to realize Zim's extraterrestrial origin. Dib's goal is to expose paranormal phenomena to the rest of the world, but is regarded as a loon by pretty much everyone, and essentially treated like crap by the very people whose lives he's trying to save. Nonetheless, while he means well, he's fairly ruthless (at times bordering on sadistic) when it comes to dealing with Zim, making him not very highly regarded by viewers who like to cheer Zim on, but the other half of the fanbase staunchly defends his status as The Woobie.

Voiced by: Melissa Fahn

"What you need is to give the Game Slave to me or I will plunge you into a nightmare world from which there is no waking!"
(after getting a negative response): "I hope ya like NIGHTMARE WORLDS!"

Dib's younger sister. Like Dib, she knows Zim's real origin, but unlike him, she doesn't much care, on the grounds that he really isn't very good at the whole world-conquering thing. That, plus she seems to be something of a misanthrope herself. (She did once have a very hard time deciding whether to destroy all life on Earth or not, when putting a can in a super-powered microwave.) Mostly Gaz sticks to her video games and snarks at the insanity around her.

Secondary Characters

    The Almighty Tallest 

Voiced by: Wally Wingert (Red), Kevin McDonald (Purple)

"The universe will be ours for the taking! It's only a matter of time before all the races of the Universe serve the Irken Empire!"
"I'll have them serve me curly fries."

The leaders (or more accurately, figureheads) of Irken society. Their height being the only qualification for office, they're not necessarily well-equipped in the brain department, although Red does seem to have it together more than Purple. Pretty much they sit around snacking and acting like jerks. Their role can be likened to a pair of teenage bullies picking on and ordering around a bunch of smaller kids.

Red and Purple weren't the first Tallest. Some of the previous leaders were slated to appear in flashbacks if the show hadn't been canceled.

One should address the Almighty Tallest respectfully as "My Tallest", the equivalent of "Your Majesty" (or, more appropriately, "Your Highness") on Earth. As a general rule of both grammar and respect, "My Tallest" is never pluralized, even when two Tallest rule in tandem.

    Professor Membrane 
Voiced by: Roger Bumpass

Friend to the world, enemy of Santa Claus.

The father (at least allegedly) of Dib and Gaz, Membrane is a scientist who also hosts the Show Within a Show Probing the Membrane of Science. He keeps a very busy schedule, to the point he can only manage to eat dinner with his children once a year.

    Miss Bitters 
Voiced by: Lucille Bliss

"The universe is just doomed. Doomed! DOOOOOOOMED!"

Teaches Zim and Dib's class.

    Invader Skoodge 
Voiced by: Ted Raimi

"So that no Irken boot has to come in contact with any unsavory alien filth! HOO-HA!"

An incredibly short Invader, and something of Zim's only friend. Had the show continued, he would have become a reoccurring character, and lived in Zim's basement.

    Invader Tak 
Voiced by: Olivia d'Abo

"I should have been an Invader! I should have been part of The Great Assigning! I shouldn't have to be stealing this planet from you!"

A female Irken out to seek Zim's mission and prove herself as a worthy Invader to the Tallests. Fifty years ago, Zim caused a blackout that caused her to miss her test to become an Irken-Elite. Not to be confused with the main character of another Nick franchise, Tak and the Power of Juju.

    The Resisty 
"You haven't seen the last...of the RESISTY! (That's right, that's still our name!)"

Latecomers to the series, the Resisty are a Ragtag Bunch of Misfits from different planets who banded together to... well, resist the Evil Irken Empire. Led by Lard Nar, a former engineer from Planet Vort.

    The Nhar-Gh'ok 
"We will take your ship! And for the trouble you've caused, we're going to destroy your base, leaving you stranded here. Just like we were."

A race of aliens led by Gorkspace Sergeant Shnooky who were stranded on Earth posing as human babies after an incident in a maternity ward. They attempt to take Zim's ship and use it to fly back to their home planet. It doesn't end well for them.

"Nobody escapes from Sizz-Lorr. I will find you, Zim. I will search all of space's dark corners to hunt you down. AND I WILL FIND YOOOOOUUUUU!!!"

Zim's boss during his exile on Foodcourtia, an Irken frycook who runs Foodcourtia's premier restaurant. After Zim escaped the planet, Sizz-Lorr swore to make him come back if it was the last thing he did.
  • Almighty Janitor: He is the biggest, strongest, and probably the most powerful Irken ever seen in the show. And his job is being a fry cook. Though in his defense he is the highest ranking Fry Cook in the entire Irken Army.
  • Badass: Proves himself to be one in the climactic scene of The Frycook What Came From All That Space.
  • Bad Boss: He was like this to Zim even before the latter ditched him on Foodcourtia and left him stuck there for 20 years. Well, Zim was already there in exile.
  • Big "YES!"
  • Clark Kenting: Zim was unable to recognize him without his fry cook hat. And Sizz-Lorr was wearing his name tag.
  • Improbable Weapon User: His laser-spatula...thing.
  • Large and in Charge: And how - he is taller than any other Irken we have ever seen, perhaps even surpassing Tallest Red and Purple.
  • Large Ham: It's a given.
  • Nice Hat: His frycook hat.
  • Purple Eyes
  • Red Eyes, Take Warning: After he finds out that Zim is gone in the flashback, his eyes momentarily glow red.

    Skool Children 
"We think Dib's even crazier than normal today! Can we use one of our Crazy Cards to send him to the Crazy House for Boys?"

The other kids in the Skool which Zim and Dib attend, which includes Miss Bitters' class. They mostly act like normal kids and have absolutely no idea that Zim's an alien.
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