@rulerofthisuniverse: Honestly, I think they'd all go insane, especially Batman. Finding out that they've merely been fictional characters all their lives..
Batman- He knew it the whole time, but kept it secret from everyone else.
Superman- He'd probably have a really hard time coping with the fact that he was imaginary, but try to stay strong for the sake of everyone else that found this out.
Darkseid- Try to modify his boom tube technology to come to the real world, thinking it to be another universe in the DC multiverse.....but fail miserably.
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