I also have a Sonic/Mario crossover headcanon: the Mushroom Kingdom exists in the world of Sonic. It's located on the northwestern border of the Kingdom of Mobius (or whichever country you think the Sonic characters primarily live in).
The home of chicken & waffles & whatever.
@bearfoottruck / bearfoottruck.tumblr.com
Welcome to my tumblr page! Here, you will find random stuff, some of which may surprise you!