Wow, these look really good.
I started playing LoL somewhere last week and Vi was a free character and I have just fallen in love with her... so naturally I want to cosplay her at some point haha. This gives me a really good idea of what to do with the shoes.
How do you plan on handling the arms and such? Personally I would love to use papercraft, to get it in full detail, but I have never worked with that before (you have to import the model in one program, then edit it so it will actually work as a paper model, then make it printable....) it's going to be a lot of work! I want to make the fingers out of foam though, so that if I 'punch' things there won't be any dents. I'm still thinking about what to cover the paper (or cardboard really) with to make it harder.
I'd love to hear your approach