Tysonanthro (aka Ryan Valdes, aka Rysonanthrodog) uploaded a video of his Krystal papercraft in 2016. Based on the Super Smash Bros trophy, he converted the mesh to pepakura format and upscaled the textures to 2K. It stands 60cm tall. There is a photo of the papercraft in his gallery, where he also has posted the PDO file for download. If you want to make this papercraft yourself, just download the PDO file and follow some papercraft tutorials.
A while back, we featured a life-size Krystal papercraft by PriamWolf. It seems there are a lot more people who have done Krystal papercraft now. Over the next couple days, I will feature the rest of them that I found. Some of them are also available for download!