generally to make papercraft you need a 3d model of a character, this can be made in nearly any 3d software. than there's software that creates it in a flattened format, which can be made into printable sheets which are then constructed into a paper replica of the 3d model.
in fact i'd presume that most 3d models from chrono cross could easily convert into a paper form.
Are papercraft usually things that people make from scratch or are they like kits that people can construct? Either way, it's pretty neat.
papercraft can be made from scratch, but generally their like kits.