Originally posted by Omega Visionclassic sentry could mindrape the planet into believing he was superman and the JLA would get a new enemy for free!
The OP states 'make people think they're Superman.'So with that in mind Classic Sentry (if he gets his hair dyed and cut) or Captain Marvel are the logical choices.
until his mind breaks down and he tries to eat the world ending up as a schizo mumbling in the subways, that is