This novel will be in Marvel wolrd and only Marvel World, no World Hopping.
It will be harem, yes, so don't ask, a bit of Smut too, there will be heads up for it.
Mc will be not op, It will be progressive from weak to Strong to Strongest.
Summoning elements.
And His Cheat is DMC Sytem, A system that allows him to have anything from DMC verse, not just be an DMC guy, it only give him powers and demons from there.