Since I don't have enough information about the particular novel, I can't provide the last name of Gordo. It could be that this is a relatively unknown or very specific reference within a certain genre or niche of literature. Maybe if you could give some more details about the type of novel or the plot, it would be easier to answer.
The 'amigo brothers' story is about two best friends who are also boxers. They have to face each other in a boxing match. Despite their friendship, they are both determined to win. In the end, they show great sportsmanship and their friendship remains intact.
The scariest might be the story of the headless miner. It's said that he lost his head in a mining explosion. His headless body is seen wandering the tunnels, and sometimes people can feel his cold presence even when they can't see him. It gives a really eerie feeling especially when you're in the dark and narrow mine passages.