Superman in Marvel
Clark Kent An his Parents are In the Marvel Universe Instead of the DC universe. (The only DC characters in Marvel)
Clark Grows up Almost the same But He was Taught Self Defence and His parents told him about his Arrival As soon as he was old enough.
S.H.I.E.L.D/HYDRA and any other Agency Have no idea About him.
Clark Has been using his powers to help people since he was a teenager but Instead of it being out in the open He Used his brain And uses his powers To Make sure their was no Cameras Etc And if there was he disabled them Before helping someone.
When the Invasion Of new york happens He is with his mother and when she sees what happening on the news she stops him before he can leave an Gives him a super suit she has been working on for years to him.
He Also gets a mask (or no mask if you want)
It took him a couple of minutes To arrive and he arrived just in time to Stop A School bus going over a bridge.
He flies around the city Using all his powers to find people in need of help and to save them and kill the aliens(He will kill if he has to and he Dosent want the government to have a live one to experiment on)
His love interest Is Black Widow/ Natasha Romanoff Only her.