As I recently mixed my own demoreel and had a blast doing that and since I have enough time on my hands I decided to be available on mixing demo reels for a few weeks. (July/ August)
So if anyone needs a demo reel mixed you can contact me at:
Don't worry, I'll do it for free xD
Edit: Do mind that the reels I make can possibly not be used for professional use because of copyrighted stuff.
An example of my own character demo reel: