Metafictional Manipulation – The ability to manipulate the line between fiction and reality. This is presumably a power all creators of fiction have. Stan Lee is the creator of many of the characters of the Marvel Universe.
Sometimes characters go beyond having awareness of the fourth wall but break the fourth wall and try to manipulate events and/or objects beyond the fourth wall.
Deadpool (Marvel) gets some very powerful metafictional tools from Galactus in What If V9 #1.
Death Rattle V1 #1 (Kitchen Sink)
Droste Effect – Is a cover within a cover. I consider a cover of with this effect to be inherently metafictional. The cover occupies a position in fiction but the effect forces the observer to consider the cover as an artificial construction.
Batman V1 #8
Jimmy Olsen – Superman’s Pal #110
My Little Margie #8 (Charlton)
Spoof V1 #1 (Marvel)
Walt Disney Comics #33