nickelodeon
Invader Tak
In Invader Zim, Tak’s main goal is to prevent Zim from completing his mission to destroy Earth. She holds a grudge against him ever since he inadvertently sabotaged her chances of becoming an Invader.
Helga G. Pataki
In Hey Arnold!, Helga Geraldine Pataki is a 4th grader who can be bossy and a bit of a tomboy. She’s secretly in love with Arnold, but shows it by teasing him as little children do.
GIR
GIR is a malfunctioning and dim-witted SIR (Standard-Issue Information Retrieval) Unit who is assigned to help Zim. However, GIR is often the reason Zim’s plans fail, especially if he’s after pizza or rubber piggies. GIR’s attempt to blend into human society seems to work since no one seems to think there’s anything bizarre about a green dog.