When it comes to overlooked leaders, I'd welcome Napoleon's nephew, personally (though I would not mind Napoleon himself either). Napoleon III. Not exactly the most accomplished leader in terms of foreign matters (save for winning the Crimean War, grabbing part of Sardinia-Piedmont during Risorgimento and enlarging the size of the French colonial empire), but oh, was he successful in domestic projects, like in rebuilding Paris, modernising many other cities of France, promoting industrialisation, building railroads and creating great economic growth. Plus, I'd love to see his crazy moustache animated.