3) President Superman
While his enemy Lex Luthor has held the seat of office, Superman has never taken over the Presidency. An alternative version of him has though – and he was based off former president Barack Obama.
On Earth-23, Kalel of Krypton lives on Earth as Calvin Ellis, the President of the US. As if that wasn’t enough, he has a secret identity as this Earth’s Superman. He’s also done something that regular Superman has never done in rehabilitating Braniac to be his personal supercomputer (who helps him keep his superhero shenanigans under cover).
Apart from being an interesting look at Superman as America’s head of state, Earth-23’s Kalel is notable for being the rare time that Superman has been depicted as African-American. There had been at least one other version, but Kalel was by far the more interesting, fleshed-out character.