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Do you know the Omnitrix can scan the DNA of Spider-Man? With Tge Ink Tank video called (What Ben 10 CAN and CAN'T Turn Into | Rules of the Omnitrix) so he should by now have his DNA in the Omnitrix aND can now turn to his version of Spider-Man, with him even being stronger and faster, as the Omnitrix gives the user the prime example of the transformation.
I don't Spider-Man will take Momo advise at all, like come on man. That will against everything that he stands for, for great power comeso great responsibility, that's one of the reasons he is THE GREATEST hero in marvel and I think him killing is not a good choice at all.
I don't know which lizard you are referring to, I still have to still disagree with you, as I think Rath is wayyyy stronger than any spiderman villain and stronger than Spider-Man but rhino is closer to his strength. But this is your story and you can write it any way that you wish, I just disagree with how you handled Rath as he easily should've won that fight.
I love your chapters man, but the one thing is that main character doesn't transform to any other aliens but the burning martian anymore. So please make transform to aliens, as that's why we are reading your story to begin with, as he has the Omnitrix with over a million transformations.