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ahoge alien alien_humanoid alternate_universe ambiguous_gender antennae_(anatomy)bald black_hair boots bottomwear clothed clothing coat comic dialogue duo english_text eyewear footwear gloves goggles hair handwear hi_res human humanoid inimoose invader_zim irken lab_coat mammal monochrome nickelodeon not_furry pak pants professor_membrane shirt shoes speech_bubble text topwear tunic zim_(invader_zim)