I love the theory of simultaneous evolution. That sometimes things happen that seem so linked but that are clearly seperate in origin. And it's true in comics. Swamp Thing/Man Thing, X-Men/Doom Patrol ...

Clownface and Panda from Body Bags from Jason Pearson – a father and underage daughter killing team, 1996, Dark Horse Comics. Big Daddy and Hit Girl from Kick Ass by Mark Millar and John Romita Jr – a ...