There are a lot of things wrong with the alternate history in the Code Geass world, it’s like the authors just threw together a few key points in history they thought were interesting and said they went differently without any real follow through. For one, Britannia apparently exists because the Roman Empire never managed to permanently conquer the British isles, or something. That’s a huge fricken deal, it would have caused everything in the Western Hemisphere to go differently but somehow most of the world apparently progressed a lot like the real world. Napoleon as the first president of the EU or whatever really doesn’t make any sense considering who the man actually was and his beliefs but whatever, not to mention Washington’s Rebellion. How did the thirteen colonies even form when all the empires that took over the Americas are fundamentally different? The BS about Benjamin Franklin always manages to make me incredibly angry, of all the founding fathers they could have chosen to be the traitor they managed to pick one of the least likely candidates. Whatever, I’m not going into all the many problems, but the one thing that really bothers me for reasons I don’t really get, why does pre-invasion Tokyo look like the Tokyo of today? That city only exists as is because the original one was burnt down by the American bombing in WWII and then rebuilt, there’s no reasons for it to look like that when it took a very precise series of events to make it, events that didn’t happen in the Code Geass universe. Nothing is more irritating than ill thought out worldbuilding, especially in products I actually like.
Is Lucy’s luck ever really explored? They hint at there being something special, especially around the Tenrou Arc but nothing ever really comes of it. I think it would have been neat to take that plot device and actually go somewhere with it, Celestial Spirit Magic as a whole really could have gotten more development, I think. The idea of it has so much potential and the Heartfilia family history too, a matrilineal line of celestial spirits who may or may not come from nobility in a country where the Princess/Queen is also a celestial spirit mage? (was that ever confirmed in the manga or it is it anime only?) I guess the worldbuilding in general is a lot of wasted potential. Mashima gave us such a wonderful world and then never really explores it, kind of reminds me of the lost potential in Naruto and its political landscape which could have been so interesting and then was ignored in favor of cliche shounen power boosts and big energy/monster fights.