Superman has often been at least metaphorically synonymous with religious figures like God or a phrophetic savior so I've often wondered how he'd react if he'd unintentionally created his own personal Lucifer. Like he ended up finding some young kid with serious potential for being powerful took him under his wing and mentored him to be his successor and carry on his ideals and beliefs. Then something terrible happens like Superman gets sent to the phantom zone by someone like Lex Luthor or maybe Darkseid. Eventually he gets out only to find the world transformed into a futuristic utopia but sadly nothing is as it seems. Like harsh punishments being enforced for the smallest crimes, curfews, censorship, no freedom of speech, and zero tolerance for those who would dare disrupt the world's so called peace.
Essentially Superman is shocked by this and assumes it's the fault of the one who trapped him in the phantom zone only upon confronting the lord and master of this false utopia Superman is shocked to discover it's his protégé who by some miracle managed to keep the Earth safe but also enslaved all of humanity. Then Superman discovers his protégé even when they were a team harbored secret resentments believing Superman never saw him as anything but a plan B and a fail safe for his own ambitions and for that reason Superman's protégé grew to secretly resent him even screaming at him in a vicious fight "I never wanted to be a hero! I only ever wanted to be normal your the one who came a long and said I had the potential to save the world that my powers gave me a great responsibility! Is the world not better? When you were locked in the phantom zone it all fell into chaos I had to step up and lead." Ultimately Superman after getting knocked around by his former protégé is heart broken because he saw a lot of himself in his former protégé like both could essentially have the same origin last of their kind both having no limits the same old story.
Essentially a Loki/Ultron type villain(like in the movie Thor and Avengers 2) who does only what he was taught(albeit by taking it to extreme levels) and sees as the most logical solution and is angry at Superman for objecting to his methods and ultimately dragging him into the super hero lifestyle. I feel a villain like this would be interesting especially if he kept trying to bring Superman over to his side and wasn't entirely wrong from his point of view.