Invader Zim Scenarios/Headcanons

Zim-
He'd stare at it with an incredulous look in his eye, wondering if it was a trap to hurt him. When he finally opened it, he realized that you had actually gotten him something, and he fell silent for a moment before thanking you. It didn't matter if it was something he didn't even like - you had actually given him a gift, for whatever reason. He began making plans to give you an even better gift.

Dib-
He'd be suspicious of it. No offense to you, but a demon giving someone a gift sounds a bit suspicious. He tried to overlook it, not wanting to be rude after you made it clear that you had no ill intent toward humanity, and he opened it, noticing that it was something that he had wanted for a while. He actually hugged you.

Gaz-
She didn't really care, so she just opened it, but her eyes grew wide when she saw that you had gotten her the newest Game Slave. You sheepishly mentioned that it seemed like her game was getting old, and she thanked you.

Gir-
He'd be happy with anything you give him. A piece of cardboard? He'll treasure it forever.
Anyway, he is super excited when you bring him something, and even more excited when he opens it. He'd hug you and say that you're the best friend ever and he loves you, and then you would watch something on the TV in Zim's house.

Professor Membrane-
He'd be very happy that you got him something, and would even tell you that you didn't have to. When he opened it and it turned out to be the exact science book that he needed, he thanked you and patted you on the head, practically bolting out the door with his new gift.

Tak-
She was skeptical when you approached her with a strange box - she actually thought that you had turned on her and were going to attempt to capture her with a gift box, but calmed down once you said you were just giving her something.
She just thanked you and took the gift, whatever it was.

The Tallests-
You had actually made the gifts and gift boxes yourself, and they were excited when they found out about them, immediately rushing to find out what the gifts were without destroying the boxes.
Once they saw what you had made for them(small figures of them), they swung you around in the air, thanking you a bunch of times. They thought the little figures were cute.

Miss Bitters-
She seemed uninterested as you showed her the box and she started opening it. Her eyebrows raised when she saw what you had gotten her, and she actually thanked you. You ended up just sitting and talking together for the next hour or so.