I think **Superman **could be Natural origin - The developers have repeatedly mentioned that Natural is meant to encompass everyone whose powers are normal/native for their race; i.e. aliens, demons, Atlanteans, Sasquatch, Elementals, what have you - but you’ve got the powerset right. He just won’t ever seem like he’s completely right without the billowing cape though… 
**Batman **would be a, a, Martial Arts Scrapper? But he’s clearly got the Blaster power of Devices.
I think a lot of comic book heroes would be incredibly hard to facsimile into the COH universe. That’s one of my problems with City Of Heroes - the limited power sets and limited ways to combine them. I mean, they’ve done a fantastic job in general - I am loving the game and will probably play it for some time to come. And I realize there’s a finite amount of resources one can spend on designing and coding and constantly tweaking a massive software rollout.
But -
Your Shaolin-style monk (a Scrapper) will NEVER be able to toss Web Grenades, or to learn to attack his foes psychically. NEVER.
All powers of a type look the same. Why can’t Blastwave shoot yellow power bolts and Gamma Gal shoot red ones?
I also think the Archetypes are a little tightly defined. Sorry, your blaster MUST have low hitpoints, and your Defender MUST have a ranged attack power, etc.
And there are, oh roughly, 3 or 400 powers in 50 or so pools, but some big omissions. No animal control/summoning? No shapeshifting? 28 ways to use Fire/Ice but no Sonic attacks?
Back on Subject: (Sorry for ranting in your cool thread, CG!)
[ul]
[li]**Flash **- obviously would have a Super Speed pool, but what else? A Scrapper? Martial Arts? None of these seem to fit him very well, let alone define his primary powers.[/li][li]**Storm **- pretty easy to do weather control type characters. I think it’s Defender, Electrical Blast, Storm Summoning.[/li][li]Spider-Man - impossible to replicate at all well for many reasons.[/li][li]Punisher - judging by the fact that he’s one of the most common ripoffs you’ll see in the game, I think he’s pretty easy to copy. An Assault Rifle/Devices Blaster - ditto Nick Fury.[/li][/ul]