Marvel Incredible Hulk #1 Bruce Banner turning into the Hulk. I think that's also Betty and General Ross on the cover.
Spoiler Click to see actual cover Winners: Aernaroth (Publisher) Aernaroth (Series) None (Issue) Aernaroth (Characters)
The Mighty Thor, published by Marvel, that's the aforementioned Thor and Hercules, I don't know the issue number.
I know you know, but just being a stickler and fair. I'm assuming that's just the title guess and you forgot to include the series/characters. (even though the title gives the other answers away)
Spoiler Click to see actual cover Winners: Dead Metal (Publisher) MTME (Series) Dead Metal (Issue) None (Character) Dead Metal (Homage)
Hint: Variant Spoiler Click to see actual cover Winners: ABH1979 (Publisher) ABH1979 (Series) ABH1979 (Issue) ABH1979 (Characters) MTME (Homage)
Hint: Graphic Novel Spoiler Click to see actual cover Winners: Sinestro (Publisher) Sinestro (Series) Sinestro (Title) Sinestro (Characters)
Yup, that's what they were going for. DC Batgirl #40 Cliff Chiang variant (which is actually the second time he did this homage with Batgirl) Batgirl and Batman
Marvel Captain Marvel The Death of Captain Marvel Captain Marvel, Spider-Man, Hulk, Captain America, The Thing, Dr Strange, Thor, Colossus, Iron Man, Daredevil, Wolverine and Death.
Spoiler Click to see actual cover Winners: None (Publisher) MTME (Series) None (Issue) MTME (Character)
Spoiler Click to see actual cover Winners: Dead Metal (Publisher) Dead Metal (Series) Dead Metal (Issue) None (Characters) None (Combination)
Spider-Boy #1 Amalgam Comics (Marvel and DC) Spider-Boy and two villains, the ice Carnage guy and a lizard thing. No idea what they're called again. Just knew it was this because I used tk have the issue.
Added a new section to the last round. Since we already know it's an Amalgam comic, see if you can figure out who the new character(s) are a combination of.
Spoiler Click to see actual cover Winners: iamste (Publisher) iamste (Series) iamste (Issue) iamste (Characters) iamste (Homage)