I made this model over the summer and I guess I didn’t get a chance to post it despite how proud of it I was. I fabricated the entire model in my head and it worked perfectly the first time I tried to fold it. It’s only merit is being extraordinarily easy to fold as there is almost no definition of the body and no tail at all. It looks more like a giraffe but it has a horn so it is obviously a unicorn. The horn could easily be modified to be ears or ossicones (those horn like appendages on their heads) but I think the simplicity of the model is better than a more complex graft with a very simple body.
Folded from a single sheet of uncut, square printer paper.