I have done it rarely, and when I have done it, it was crappy due to my lack of money for materials. I have done Alex Mercer from Prototype, and Slenderman, too often ha ha. I went to my schools Swimming and Athletics carnival as Slenderman, and ran the 100m relay dressed as Slenderman, coming first. The year 7s now call me Slenderman. I also went onto omegle dressed as Slendy, but that's a whole other story.