Before transmigrating
System: Your secret identity will be random, but your targets are fixed. Can you handle it?
Protagonist: I'll try, sob sob, but I can't act, sob sob.
System: Don't panic! You can make up your secret identity's character however you like! I'll cover for you if anything happens!
Protagonist: Thanks, System, sob sob.
After transmigrating
In public, the protagonist is handsome and charming, openly seducing his targets, but gets nowhere.
System: Don't lose heart! Keep at it!
In private, the protagonist gives up and can only whimper. Somehow, he succeeds in winning them over.
System: What luck! Try harder next time!
After the umpteenth time
Protagonist: My character's gone off the rails. I was faking it, teehee.
System: Just destroy everything already!
1. The little Spider saves the pretty bookworm yet again, and the delicate boy blushes and apologizes.
Then, during the Battle of New York, the bookworm can punch three aliens into the air with one hit.
Little Peter: ???
2. The CEO faces reporters with a cool, chaste air as Wayne watches.
That evening, the CEO's car gets a flat. He grips his phone for half an hour without daring to call anyone, socially anxious, withdrawn, and helpless.
Batman: ?
3. At the Stark Expo, the genius researcher is sharp-tongued and arrogant.
That afternoon, the researcher is cornered in a hallway. When someone confesses to him, he runs for it and crashes into a rich guy.
Stark: ?
4. Captain America watches a movie where the leading man makes a bold sacrifice on screen and wins this year's Best Actor award.
Outside the memorial, the award-winning actor begs his agent for a hookup, only to get chewed out.
Steve: ?
No secret identities exposed, multiple storylines, romance not guaranteed, but the protagonist is definitely the top.
Theme: You have to know how to adapt in life.