I choose food but I don't think like solid food stuffing, I picture a machine with thick liquid food of some sort forcefully filling them up, but not in a fattening sense.
my inflatee is filled with...
Blended celery? Pretty much one of the most non-fattening foods there is.
I mean that whenever people draw these things involving food or processed food, they usually have a weight gain aspect to it, which is a big turn off to me. I picture some sort of synthetic liquid that's really thick and stuffing like processed food but doesn't make the character fat afterwards. Just round or gets a giant round belly.
Example: (Slightly NSFW/anthro)
http://alwyn-mallory.deviantart.com/art/Cheetah-FF-1-of-3-105270123
http://alwyn-mallory.deviantart.com/art/Cheetah-FF-2-of-3-105270258?q=gallery%3AAlwyn-Mallory%2F10696313&qo=57
pregnancy. inflated with baby. lots of swelling. moms the word.
better than wonka gum i think.
Air but so long as I'm the inflatee.
If you inflate yourself, you are your own inflatee i think
Guess so. Would prefer to be someone else's inflatee though. ;3
Warm water/gel, unless it breast expansion in which case milk.
Something explosive/flammable, like hydrogen, oxyacetylene gas or even something that turns my very chubby inflatee's fat explosively unstable.
as i imagine it - inflatee is mostly full of herself. A bit of air (for ground competitions) or helium (for flying) only gives her initial stuffing to start inflation.