Teen heroes
Foxbat junior- He would have been investigating this restaurant since the name sounds suspiciously Foxbat-ish. due to the suspicion he would also be on edge expecting Foxbat affiliated fans and villainy unlimited copyright lawyers to both swarm him to protect the mighty Foxbat. ( I'm sure my hunted by both those groups would get a bonus in an establishment like this.) he would be super surprised if the name was coincidental and foxbat does not own this restaurant for some reason. If his investigation turned up black Harlequin. he would give in to the purge suit/ put it on and kill him.
lucha Larry- He would look for people twirling their mustache. if he could not find that he would give up. His job is to wrestle not think
Adult superheroes.
The Toon Titan- Would dig through his bag of tricks causing considerable all damage to the environment until he found a thinking cap so he could help figure this out.
Millennium Paragon- assuming he could overcome his fear of robots, would use the considerable technology in his early model Dr destroyer suit [The character was built with one of the plot seeds from the book of the destroyer where a relative has an earlier suit.] even if he could overcome his fear he would be terrified The Nanny would Download her intelligence into the robot in order to find him. If he still has the purge suit he would hunt down Mechana/ the Nanny after destroying the robot