In the US, Kinokuniya carries both magazines in their retail locations. They also have a rudimentary online order service, which is primarily book focused. If I remember correctly, you may not be able to purchase the magazines via the website, but if you call their phone order line, it is doable (if a bit awkward).
https://bookweb.kinokuniya.co.jp…
Retail locations:
https://bookweb.kinokuniya.co.jp…
Where can I import (or read online) Japanese magazines Men’s Ex and Leon from?
BEEF.
In beef-loving Hida-Takayama, this is a common delicacy, I was really sad when I couldn't find them serving it up this way anywhere else in Japan.
If you go by power level, Green Lantern
If you go by mainstream recognition, The Flash
If you go by "cool factor" for the few people who ever notice him, Martian Manhunter
If you go by Hughesian Debating Skills, I'm totally won over on Aquaman 🙂
Personally, I use the "Dan Brereton Coolest Art/Pose" factor, which again I would argue gives a pretty solid win to Aquaman:
If you agree that Superman, Batman & Wonder Woman are the DC big 3, who's #4?
This is a bit tough… Given the particular wording of your question, I'd go with Superman. He's the first archetypical "superhero" who appeared in comic book form, at least in the US… 
According to Wikipedia[*], the French once again beat us to the punch with a fella called the "Nyctalope": 
As far as other possible "first placers", you have all manner of costumed superhumans or "ultimate" humans –
– all of whom, if they magically dropped out of subspace in the Marvel or DC Universes, would be instantly recognized as "Superheroes", or possibly "Super villains" in some cases.
Nevertheless, just about all of the other candidates appeared first in print books and magazines, comic strips, and radio dramas, and most did not take a strong stand in the comic book format until well after Superman had led the way as a groundbreaking title in the genre/medium in 1938 in Action Comics #1.
[* It's actually a great Wikipedia entry: http://en.wikipedia.org/wiki/Sup…
I'm pretty sure that simply hitting him a few times with the Ultimate Nullifier would do the job.
Alternately, redirecting him to consume another compatible living world has been known to work in the past, though I'm not sure that would qualify as a "defeat".
deano.com 