"He just never seems to become an adult"

What are you expecting? That fictional superheros grow up and get old?

Spiderman first appeared in -62, so you'd have never seen him as an immature teenager, but a grumpy middleaged dude.

On that note, there are depictions of adult Spiderman. Like in "Into the Spiderverse" or what was it.

But the essence of the character is the relative immaturity. Like Batman's is gruff vigilanteism and Superman's overtly good nature.

There are tons im not wild about. Can't stand. I dunno. at this point there have been multiple versions of most and usually at least one interpretation is decent.

I agree with spiderman, I've still not watched his stand-alone movies.

Also hulk once he becomes "smart" hulk in end game.

Also fat Thor in end game, again not funny just whiny.

All of them: I want authenticity,

and "superheroes" are fake human-meaning, engineered to push distractine power/ego-fantasy instead of actual-human development.

Read both of John Truby's books, "The Anatomy of Genres", & "The Anatomy of Story", and become much competenter in what story/movie makers should be doing,

and then consider how much is being invested in preventing realism-of-context from being known by mass-media consumers..

..and then understand the long-term consequences of deliberately/systematically diverging mass-awareness from what real meaning, real human context, is, .. through decades..

It's part of a whole-class, or whole-population, suckerpunching, but it seems to be of unconscious, not conspiracy, intent.

Pretence-programmed populations are less realistic & less reality-competent.

Bollywood & Hollywood both produce divorce-from-reality.

That isn't required, for story, or human-meaning, is it?

All but Dexter.

Captain America