This sounds like a fun idea! I can help art wise. ^-^
You can use the art of my unedited pixie queen art for it if you want to try something with it. I can try making other art Hero related abit later.
Pixie
I was thinking maybe doing hand written ones, and typed out ones.
and about the cosplaying at cons and passing out things, you would need to get in contact with the con heads and ask for permission to pass out things. They can kick you out for passing out flyers without telling them first since some are minors and people can pass out freaky things. x.x
Usually, all the cons I've been to you have to have a booth to do that.
and here's a tutorial on how to put on a wig.
Wig Tutorial
I put on two wig caps though since I have thick curly hair. One a mesh, the the other the nylon. Also, you would want to get a cap either skin colored or the same color of your wig, depending how dark or light your wig is. A black should be fine though since Alices hair is a darker blue.