Heroes of Marvel https://www.novelupdates.com/series/heroes-of-marvel/ Actually not bad writing for a fanfic
theres a novel called dominating marvel where he sets up a sect and recruits characters from marvel and teaches them cultivation
I think I've seen some iron man flic somewhere here, forgot the title. But if you want there's a one piece fan fic which isn't that bad. God of soul system. PS- XD man that pic of yours cracked me up