MARVEL and DC universes collide again.

[LegionAlpha]

 

[Techwright]

Amalgam Comics these are not.  There's some bizzare choices there.  The Batman/Ironman one makes sense, but many of the others fused hero (or anti-hero) with villain.  And many I don't even see the characters as being in the same room, let alone in a fusion.  I will say the Flash/Hulk fusion would be well nigh unstoppable, lacking only flight and space flight.