I don't watch mlp either, but from what I've heard, that's the one. It will actually hold up to kami if you fold carefully enough (I refolded it two days ago to refresh my memory), but the head gets very thick. The mane, tail, and wings are really nice, though. XD
1.) 12.5 in and 14 in squares 2.) White 3.) Kraft-thickness (a little less than copy paper?) 4.) Kraft paper 5.) As long as it's relatively foldable at that size, any difficulty. I'm looking for animals or any mythical characters/creatures that are involved in ancient European literature.
If i ever get the diagrams done for my dragon, I can send you them. And yes, thin kraft should work pretty well for the Little Pegasus. You'd need about a 30cm square though.
I usually fold my dragon from an 11" square and the Little Pegasus from an 8" (a bit too small XD), so you should be good. It might take a while for me to post them, though, because I can't draw.