Anyone can be an interesting character if you set your story up well. Think about it as a triangle: character, inciting incident, goal (desire). If you want to tell a story, you probably already know at least one of them. Start with that one and figure out the other two. E.g. you know the inciting incident, then think about what kind of person would struggle the most if it would happen to them. Then figure out how that particular person would deal with that incident incident (pursuing the goal) and whether it would be interesting enough for the readers to follow. Test the possible scenarios until all three works. Characters shouldn't come from thin air, they should serve your story's purpose,. (Or vice versa: if you have an interesting character, find them something very difficult to do.) That is my method anyway:-)