I've been giving a little thought recently to the concepts of "monster rallies" and "villain rallies," and how often these have been featured in various media, as opposed to the more frequent "hero rallies," better known simply as "team-ups."
However, since I'm the only one that uses the neologism "demihero," denoting thereby a fourth essential literary persona there are of course no "demihero rallies" as such. They do exist, but audiences merely think of them as plain old "character crossovers."
From the 61 entries I completed on my possibly abortive 100 GREATEST CROSSOVERS OF ALL TIME, here are the ones featuring demiheroes. I'll add a comment only when the demihero persona is mixed with of the other three personae.
DYNASTY AND THE COLBYS
STEVEN UNIVERSE (hero) AND UNCLE GRANDPA (demihero)
THE MAN WHO HATED LAUGHTER (mostly demiheroes, though some of King Features' heroes, like Mandrake and the Phantom, make brief appearances)
WHO FRAMED ROGER RABBIT? (Non-toon Eddie Valliant is a hero, all the rest, from Roger to all the cartoon revivals, are demiheroes)
FONZIE AND MORK
SIMPSONS AND FUTURAMA
DREAM-QUEST OF UNKNOWN KADATH (mingles demiheroic protagonists and monstrous entities and settings)
ARCHIE BUNKER AND MAUDE
More on this subject later, possibly.