A common suggestion is to add player-generated content, but these systems have been buggy in STO and NWO.
Thus, I suggest you can add something that's actively under the control of a human. Something simple would be to have a private instance in a computer generated map, or a copy of an outdoor area. Then have one player be dungeon master who could spawn various enemies for the other players to fight. At its simplest, it could just be a copy of the 'group battle simulation' in the powerhouse without the hologram aesthetic and a few options of locations to fight in.
That would facilitate role-playing.
There's a concern that since this is an MMO, the non-rp type players might set up some sort of G farm. If that's an issue, just make the rewards worse than grinding Smash alerts.
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There's an alternate way of doing superheroes vs supervillains: team duels. If you need to balance them, include a ringer on one team or another that's lower level, and everyone on that team SKs down.
Epic Stronghold
Block timing explained