Superman: Legacy, the DC Universe’s Superman movie reboot, should copy The Batman’s Joker reveal to establish Superman’s greatest nemesis. Though The Batman and Superman: Legacy are part of two separate DC franchises – the former will remain in its own universe while the latter will kick off a new DC Universe – there are many similarities between the two projects.The Batman followed a young Bruce Wayne who was already Batman, which is similar to what Superman: Legacy will do.
https://screenrant.com/superman-legacy-lex-luthor-copy-batman-joker/