I just remembered Guido Crepax’s Neutron.
But in looking for information on him, I came across An International Catalogue of Superheroes.
Yeah, I don’t know about that one either. There are a lot of superheroes who take orders from higher-ups, even though they’re usually unpaid. As was pointed out, Batman at one time had official status with the Gotham City PD. Then there’s Captain America, Green Lantern, Hawkman (the Thanagarian version), Captain Atom, Plastic Man, the Guardian, the Legion of Super-Heroes, and that’s just off the top of my head.
Valid point. Now, there was a story arc where the Judges suppressed a democracy movement, by such means as falsifying evidence. Dredd purists don’t agree with the writing in that story; the “real” Dredd would never do such things.
But, yeah, the guy is a bit of a fascist… (He’s also the only one who doesn’t get the joke. The stories are comedy, and Dredd doesn’t have a sense of humor!)
Whuut? One not a superhero, one a mythological character and one not popular. Can you grade my midterm please? 
Superman, for much of his existence, for instance (until the 80s, and again from the 90s on, even when sewn by Martha Kent, his costume had the same style as standard Kryptonian clothing, and in several versions, such as the current one, actually WAS Kryptonian in origin).
Dredd is as much a superhero as iron man. His power is technology based, but a power nonetheless.
Well, yeah, but it’s power that isn’t absolutely out of reach of the ordinary citizen. Sure, the Lawgiver pistol is pretty extreme, but during the Block Wars, ordinary citizens had cannons, lasers, missiles, and lots of other deadly stuff.
(Of course, in the Marvel universe, powered armor is becoming remarkably commonplace also… I’m surprised the New York Fire Department isn’t fully equipped with fire-fighting p.a.)
Another definition of superhero:
A character originating in a visual medium who is a) a hero (not a villain) b) wears garments that would be considered a costume to the reader, c) has an in-world superpower or at least has an extraordinary ability at fighting and d) fights criminals or mustache twirlers.
So: The Watchmen have value-challenged characters, but they are superheros nonetheless. Spock wears a costume and has super-powers, but they are not super-powers within the story - all Vulcans have them. So he’s not a Superhero. The Punisher and allegedly dark superheroes are superheroes.
Shinji Akari from Neon Genesis Evangelion doesn’t fight criminals. Constantine wears no costume. Asterisk doesn’t fight criminals. Q from Star Trek is a villain. None are superheros.
Namur is a superhero (assuming he has some special power - I’m not familiar with the series). The key thing about the costume is brand identity and frankly ease of drawing a distinctive character in an assembly line manner. Judge Dredd appears to be a superhero from wiki. Batman has within-world extraordinary abilities. Ditto for Ironman.
Naruto is borderline. I don’t think he’s wearing a costume, though admittedly his clothing looks a little odd. Dragon Ball Z characters wear gis, also worn in Japanese Dojos. Not sure whether they are costumes.
To tell you the truth though I prefer this definition:
Costumed heroes in a story primarily appealing to power-fantasy.
Heh I boggle at your lack of knowledge about namor. He is one of the handful of class 100 humanoids in the marvel universe (not including aliens, gods, supernatural beings, etc.) and is one of the few that can go toe to toe with the Hulk. Aquaman as well. He is considered class 80 on the DC scale (superman would be 100.) For both of them, their strength, even though it is rarely used, is mainly attributed to being able to survive at great depths. His other claim to fame is that he is credited as being the first true mutant ever in comics.
Kind of an aside, in another thread we were talking about ludicrous novels, and one of namor’s stories is one of my favorite to tell:
“So there’s this dude namor, who is virtually as strong as the hulk, and he’s trying to get laid with Sue Storm (before she marries Reed Richards.) He gets cock-blocked, and all hot and horny he swims to the north pole and decides to beat up on some eskimos. Inadvertently, his hormone-fueled rage causes him to destroy the eskimo’s altar to the frozen god, who in actuality is Captain America, frozen in a block of ice from WW2.”
Sampiro, I’d have thought you’d be a fan of Northstar.
Cough Zenith in 2000AD Cough
Why the need to originate in a visual medium? A number of caped do-gooders who excel at foiling comic-book villains debuted in, uh, book-books; IIRC, the first fictional character described as a “superhero” first appeared not in comics, but in – well, to be honest, I’m not sure how few illustrations accompanied him in print, but that’s sort of my point; by your definition, we can’t dub him a superhero based on what he’s done since the '30s until we find out he was presented that first time.
(I mean, if I someday write a best-selling novel about a superpowered crimefighter who wears underpants over top of his tights, would you forbid me to describe my character as a superhero? “Well, your novel isn’t a visual medium, so he’s just a masked vigilante with bulletproof skin.”)