Gir is Zim's disfunctional robot.  If you are wondering how a robot can be a green dog, then here's the answer.  It is his Earth disguise.  He is sooo cute as a green little puppy dog! 
     Anyway, the Almighty Tallest give every Invader a S.I.R., or a Standard Information Retrievel unit.  But since the Almighty Tallest gave Zim a phony mission, might as well make it perfect.  So they make Gir, a robot made of spare robot parts and paper clips, cotten balls, fuzz, and other assorted crap.  No one knows what the G stands for. 
     Gir loves almost everything.  Some of them are Chocolate Bubble Gum Suckees, Cheese Pizza, Acne Blaster, Pigs, and many more things.  Oh yea, and especially TACOS! AND BURRITOS! Yes, he loves those so much he eats them. 
"Leprechaun!"
    Characters
Gir - Doggy
Gir - Doggy
"Awww, it likes me!"
Gir's Chocolate Bubblegum Slush
   Gir
Gir - Robot
Gir - Robot
Wazzzzzzzzap??
Gaz
Wazzzzzzap??
    Gaz is just like me.  She loves to play her Gameslave, she likes to draw, she like pizza, etc.... Excluding the purple hair, and the black clothes, and you've got me!  Oh, but I missed one very important detail...SHE HATES EVERYONE! 
     Gaz is Dib's little sister, but she doesn't act younger.  She bosses Dib around like a dog.  She loves Bloaty's Pizza.  And she has a Gameslave, somewhat like a Gameboy Color, and she plays it everywhere she goes.  Dunno what's up with her eyes though, I guess too much eyeshadow. 
     She never believes Dib and she thinks that Zim is just another stupid kid smacked on Earth just to bother her.  She has even seen Gir and Zim without their diguises, and she didn't act like they were anything new to sneeze at.
Hey, where do you think you're going??  There's no more characters! E-mail for ideas!
You really want to see Dib and Zim, huh?
Aww, going home already??
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"You will pay for getting me wet....."
A thinking Gaz