Here in the Czech Republic, we have a man named Jára Cimrman, who was one of the gratest poets, musicians, teachers, philosofers, authors, inventors, scientists, athletes and an misunderstood genius. But his character is completely fictional. And that's the whole point. We all pretend he was a real person, even though he wasn't. There are so many sights named after him and there is also a really famous comedy theatre group (Divadlo Járy Cimrmana) performing plays he "wrote". I think this is the most czech thing that exists, I'm curios if your country also has something similar.