The many faces of Zim and GIR

Been on a bit of an Invader Zim trip lately... so I decided to try and draw them as pokémon~
Aaaaaaand I failed miserably. Instead, have a picture of baby Zim, human-disguise Zim and Invader Zim. (XD)
And underneath him, GIR, disguise-GIR and bloody GIR.

Let's just say the sizes are relative to how dangerous each "face" is...