As someone who hasn’t read the comics. For me, it’s Omni Man. I didn’t realise it until season 2 but I really felt his absence the first few episodes, and his story was definitely the highlight of season 1 for me. I find his internal conflict quite engaging. We’ve seen plenty of evil superman stories, but I like the idea of an evil superman redemption story. I like that he did the things he did because he felt like it was his duty rather than actually wanting to conquer Earth. Then regretted them afterwards. Also seems like despite having committed atrocities on Earth, he might well be the most morally conscious member of his species. Which is really interesting. There seems to be a bit of a nature car nurture plot emerging with the Viltrumites.