Averted with The Falcon, one of the first major African-American superheroesnote While Black Panther came before the Falcon, he's native African rather than African-American. (and the first one not to have the word "black" in his name), who frequently teamed up with Captain America. Yeah, he's black, but it's not his whole identity. Notably, when he was first drafted into The Avengers, Sam was so upset when he found out Gyrich enlisted him exactly for this purpose, that led him to quit.
Eli Bradley: What up, Black Falcon? Isaiah Bradley: He ain't a Falcon anymore. But he's still Black.
Most of the characters introduced in Contest of Champions (1982). This book started out as an Olympics special, only to be repurposed after the USA declined to participate in the 1980 Moscow Summer Olympics.
Only Shamrock (Ireland) caught on though she was mainly used as a comedy hero.
China's "Collective Man" made a comeback as an X-Men villain/the new main face of China's super-hero community after Radioactive Man was exiled to the US.
Quite a few of them crossed the line from stereotype to offensive stereotype — e.g. a German character named "Blitzkrieg". All Germans Are Nazis, indeed. Granted, he's a German with lightning powers and "Blitzkrieg" means "lightning war", but given the Nazi connotations (which are even greater in the Marvel Universe, seeing as during WWII there was also a lightning-themed Nazi supervillain who used the name)note Via retcon, this was even the first costumed supervillain Captain America ever fought. it was a really terrible choice. The House to Astonish podcast has speculated that either 1980s West Germany was a very different place in the Marvel Universe than it was in real life, or this guy was completely ostracised by the German superhero community, and was either too thick to see the problem or was a Troll who revelled in it. A later story would suggest that in Germany he was known as Der Blitzkreiger, which isn't really an improvement.
Defensor, a conquistador-styled hero from Argentina.
Sweet Christmas! Marvel's very own, shirt open to the waist, huge afro-haired, jive-talkingblaxploitation character Power Man! He tends to be a lot less over-the-top in recent Marvel titles, although the MAX series Cage went even further into blaxploitation than the original, which led to it being declared Canon Discontinuity. The modern character combines Bald Head of Toughness, Scary Black Man, Jerk with a Heart of Gold and Made of Iron; has abandoned the slightly-goofy 'Power Man' in favor of simply calling himself 'Luke Cage'; fights crime in a tank top and hiking boots; and regards his yellow-disco-shirt-and-Afro days as an in-universe Old Shame.
In Marvel's Earth X continuity, the Asian hero team Xen included Sumo, Chi, Sai, Tora, Tao and Banzai. It frankly bordered on being offensive.
X-Men: Most of the "all-new, all-different" X-Men are exceptions; though they come from all around the world, most have heroic identities unrelated to their country of origin. The big exceptions are the previously-established Banshee, an Irishman dressed in green and named after his screaming power (who had actually first appeared in the original series), Sunfire (who had also appeared before, as above), and Thunderbird, a Native American with an eagle/headdress theme; by the third issue, the latter two were gone. Sunfire quit because he didn't like the group (the feeling was mutual) and Thunderbird was killed off in a Stupid Sacrifice because his personality was so similar to Wolverine at the time that having both of them was deemed redundant.
Sunfire, a Japanese hero with a "rising sun" motif whose origin was that his mother died after giving birth to him after Hiroshima (his first appearance being published in the late '60s), resulting in his uncle convincing him to take his revenge on the US. Later revealed to have a teenage younger sister, with the same mutant powers, fashion sense, grouchy personality and even homonymous codename, Sunpyre (Fire = Pyre, get it?).
Colossus is a very clear example. He can change into a "Man of Steel" (the literal meaning of "Stalin"), and as such he is a mutant from the USSR with an actual "Stalin" power, in addition to his Gratuitous Russian. His last name is even Rasputin (later revealed to actually be a direct descendant of the infamous RL Rasputin, who in the MU was actually an early mutant supervillain himself).
Though not necessarily Captain Ethnics themselves, many ethnic X-Men members were (and in some cases still are) unable to complete a sentence without using some word from their native language or local slang, for the sole purpose of reminding the reader that they are, indeed, from somewhere else. Of course such uses are rarely correct, face-palms abound when Brazilian readers see Sunspot dropping lines in Spanish (they speak Portuguese). The worst offender in recent years is Gambit, whose Cajun dialect ranges from "kind of annoying" to "downright incomprehensible." As far as writers go, Chris Claremont tends to be the guiltiest of this.
Maggot, a short-lived member of the team from 1997-1998, was a black South African. And he would never let you forget it, because his speech was impenetrable due to overuse of South African slang. Most of the time it was hard to even extrapolate from context. Also his origin involved starvation cuz he's African, and even as an adult he's emaciated unless he's in his Super Mode.
Afghan Muslim X-Girl was called Dust, and was originally intended to have suicide bomb powers before they were changed to "can change into sand that can flay flesh from bone." She's actually been rescued from the Captain Ethnic heap, thankfully, in part because of the respectful way the comics depicted her choice to wear her niqab. She still suffers from a few mistakes, however, in that she speaks Arabic when almost all Afghans speak Pashtun or Persian. Even as a second language, Arabic is less common in Afghanistan than English. Though this actually makes her less "ethnic" in the sense that not having her speak any of the major Afghan languages means she can't be clearly tied to a specific ethnic group (of which Afghanistan has many).
As it happens, one newer student at the Academy, Gentle, is one of these for a nationality that doesn't actually exist; he's from the fictional nation of Wakanda, Black Panther's home country, which is known for its massive deposits of the equally fictional metal Vibranium. Not only does he have tribal tattoos all over his body... they were done in Vibranium ink, making him the Wakandan equivalent of a Kuwaiti mutant with oil powers.
The original lineup was a whole team of "Captain Canadas" as they each represent a different region/cultural aspect of Canada. Team leader and founder Guardian (who is consciously modelled after Captain America) is from Ontario, aquatic alien Marrina grew up on the Atlantic coast, mutant twins Northstar and Aurora are French Canadians from Quebec (with Northstar a former separatist terrorist), Genius Bruiser Sasquatch is from British Columbia, Inuit demigoddess Snowbird is from the northern territories, Puck (as in hockey puck) is from Saskatchewan, Guardian's wife Vindicator is from Alberta, and Shaman is also from Alberta while doing double-duty representing the First Nations.
One arc featured the team trekking across the globe and running afoul of local heroes in various countries — like the Italian Omerta, a monk who has taken a vow of silence. "Omerta" is Italian for silence, but it's also used to refer to the code of secrecy in The Mafia.
Deadpool: Issue #1000 has a story wherein Deadpool is recruited by the Canadian government to be Canadaman, alongside Canadian superheroes Puck-man, Moositaur, Beaver, and Ms. Puck-man. The team, sans Deadpool, is presumably killed in the team's maple leaf-shaped plane after Deadpool learns that he was the second choice, the first being Wolverine.
Silverclaw is the Latina analogue to Snowbird, the half-human daughter of a pre-Christian native goddess and a modern-era human male who is a member of the tribe which used to worship her, who also possesses the ability (like Snowbird) to transform into various animals native to the region in which her mother was worshiped. While her mother is a completely fictional made-up MU-only deity (a Caribbean expy of RL Polynesian goddess Pele), likewise with her father's tribe, the pantheon which her mother belongs to is a mixture of various RL Native American pantheons.
Jubilee, the young X-Man of Chinese descent whose mutant power was to... shoot fireworks. On the other hand, she was Book Dumb and especially bad at math, so she definitely wasn't a stereotypical Asian-American.
Also see Wasabi No-Ginger of the Japanese superteam Big Hero 6. A katana-wielding chi-manipulating sushi chef whose codename combines two distinctive ingredients in Japanese cooking, he is essentially Iron Fist meets Iron Chef. Although to be fair, he's a master of every style of cooking. Big Hero 6 in general is made of stereotypes from Japanese media, particularly in its Sunfire and Big Hero 6 days: its leader is a teenage boy genius (Hiro) with a robotic protector, a la Giant Robo or Gigantor (although Baymax isn't kaiju size...). who is implied to secretly be the resurrection of his deceased father in a mechanical body a la Ghost in the Shell; a ditzy supergenius (Honey Lemon) a la Mihoshi from Tenchi Muyo!, with an inexplicably blond-haired blue-eyed Fauxreigner appearance a la Kaere Kimura from Sayonara, Zetsubou-Sensei (which is implied by her off-panel Backstory to be due to the result of a body switch, making her the Asian counterpart of the X-man Psylocke) with a super-science technomagic purse a la Doraemon; a juvenile-delinquent punk bad girl (GoGo Tamago) with a henshin-type voice-activated energy-transforming armor suit a la Metroid's Samus Aran; and a loner-slacker expy of Persona 3 badboy anti-hero Shinjiro (Fredzilla), who is apparently the avatar/host a la Naruto of an ancient monster spirit expy of Godzilla, which manifests itself exactly like the aforementioned Personas in the classic RPG series.
Another ostensibly-international team of superheroes who were really only Red Shirt cannon-fodder as well was Marvel's expy of DC's The Great Ten, called the People's Defense Front, who were introduced and subsequently disposed in the space of a single splash page, where they appeared as a badly-drawn and vaguely-detailed army of nameless and faceless super-powered spandex-clad drones who were massacred simply to show how bad-ass was the Big Bad of the story (an Inhuman expy of Sauron). Not surprisingly, the only characters who they even bothered to actually identify (longtime Marvel Chinese anti-hero/anti-villains Radioactive Man & Collective Man, and generic newbies Scientific Beast, Lady of Ten Suns, Princess of Clouds, 9th Immortal, and Most Perfect Hero — the codenames are admittedly cool but the visual designs were so basic as to be simply bleh) were later revealed as the only survivors of the massacre.
The Dynasty, China's equivalent of The Avengers, fares better in that regard, with most of its members having names and powers not tied to Chinese stereotypes. The exceptions are the Revolutionary and Star, the latter of whom is basically a Captain America Expy draped in the colors of the Chinese flag. Seeing as the Soviet Union (back when it existed) had its own blatant Cap expy Vanguard (as well as Britain's Captain Britain, Canada's Guardian, France's Adamantine, Japan's Sunfire, Saudi Arabia's Arabian Knight, Ireland's Shamrock, etc.), it's just the kind of thing a major world power does in the Marvel Universe.
Static Creator Dwayne McDuffie sent his colleagues at Marvel this pointed, very funny fake pitch in the late 80s: here.
Lampshaded and averted in Supreme Power. There is only one American superhero that is black—Super Speedster Stanley "The Blur" Stewart—and the viciously racist black supremacist Nighthawk is pissed that said hero is less powerful than Hyperion, the first hero to appear (who is—seemingly—white). Nighthawk himself is an invoked variant of this trope; he's an African-American superhero who defines himself by his blackness, focusing exclusively on crime targeted at African-Americans to the extent he will literally turn a blind eye to black criminals assaulting, robbing and raping white civilians. The only African-American criminals he will ever voluntarily go after of his own accord are drug dealers, and that's because they fit firmly into the "white supremacist collaborators" side of his internal narrative. He actually takes it to a level that he's almost as racist about blacks as he is about whites.
Bloke from the Milligan-Allred run on X-Force is an intentional parody, being a combination of so many gay stereotypes that he Crosses the Line Twice. Originally being rainbow in color before permanently turning pink, Bloke loves musical theater and has impeccable taste in soft furnishings. And lives in San Francisco. And can usually be found in the gym. He also subverts this slightly by being an especially brutal and grim vigilante. Did we mention he's a great dancer and has many strong opinions about certain civil liberties? Also, he's British and his real name, Mickey Tork, is taken from two of The Monkees (Micky Dolenz and Peter Tork). When he dies, his lamentation that he's just "one less of 'my kind' to worry about" now is intentionally left ambiguous (meaning it isn't clear whether he's referring to homosexuals or mutants as "his kind"), and teammate Phat's reaction to this statement foreshadowed his own coming out of the closet.
Parodied after the change to X-Statix by Spike Freeman's new team, EuroTrash, with such stereotypes as the French Surrender Monkey (who, admittedly, is later revealed to be an American making a pathetic attempt at going native) and the clumsy British oaf Oxford Blue. "Mr. Freeman, don't you feel these heroes are all crude foreign caricatures?" "What can I say? I'm American. That's how we like our foreigners."
Oh hey look, New Zealand gets its own mutant. He's a Maori! Cool. He's got the tattoos! Still good. He's called Kiwi Black... (To clarify for non-New Zealanders, "Kiwi Black" is a brand of shoe polish. An iconic, much loved shoe polish, but...)
There are also two villains known as "the Kangaroo":
The first is a brawny meathead with powerful jumping ability.
The second wears a suit of kangaroo-like Powered Armor.
Marvel has not one, but two (count 'em) Aboriginal superheroes who swing a bullroarer that sends them into the Dreamtime. Talisman (no relation to Alpha Flight's Talisman) from Contest of Champions (see above) and Gateway from X-Men.
There was also Dreamguard from Force Works. He didn't use a bullroarer, but he did have dream based powers and wielded a boomerang as his primary weapon.
For a while Boomerang had a new identity as the Aussie flag wearing "hero" Outback.
The French stereotypes are très plentiful.
Minor Daredevil villain Frog-Man, real name Francois LeBlanc... you can probably see where this is going (if you can't, "frog" is a derogatory term for a French person), but he looks incredibly frog-like even out of costume.
Infamously, we have Georges Batroc, the Leaper. Named after "Batrachia", a genus of frog, and possessing incredible leaping and kicking power, Batroc is a silly French stereotype through and through (just look at his mustache!), but due to the joy he takes in his role and Memetic Mutation he is regarded as incredibly awesome nonetheless. The fact that he's a Badass Normal who can take on Captain America in a fair fight and is known for being a Noble Demon also helps his rep. Further tying the two aspects of his theme together, he practices savate, which is a French martial art that involves a lot of kicking and jumping. Oddly, his costume doesn't seem to have anything to do with either theme.
In a Civil War issue of Fantastic Four we encountered Les Heroes de Paris. Who went a different route: They were all thinly-veiled expies of the Justice League of America. Only... well, French. Including Adamantine (French Superman dressed in the Tricolore), Le Comte Nuit (a non-bat Batman), La Lumiere Bleu (Green Lantern, only blue) Le Phantome ("Who haunts the Louvre at night"- Looks like The Question, with smoke for the face instead of a blank mask), Le Cowboy (Guess), Le Docteur Q (Lex Luthor in his modern-era armorsuit), Anais (the Halle Berry-version of Catwoman crossed with Vixen), and Le Vent (The original concept of Golden Age Flash as a magic-based speedster). And The Thing, who had briefly joined them out of disgust for the actions his teammates had taken.
Tarantula is a Delvadian criminal whose pointed shoes allow him to scale walls. Pointed shoes are a stereotype in and of themselves, but this guy's a South American whose equipment allows him to scale walls. Think about that for a minute.
At one point, Taskmaster ran into Batroc and the Tarantula's daughters, using their respective father's gimmicks. Tasky soundly thrashed the villainesses, stating "I hate ethnic stereotypes". Though not before quipping about how surprised he is that their fathers aren't virgins.
One of the frequent members of Batroc's Brigade is the South American mercenary Machete, whose weapon of choice is probably obvious.
Multiple Crimson Dynamos have been stereotypical Russians.
The second Crimson Dynamo was a slow-witted goliath named Boris (and married to a woman named Natasha). It's not entirely clear whether the Rocky and BullwinkleTheme Naming was intentional, subconscious, or simple coincidence, but it's still there.
Hell, even the Gennady Gavrilov Dynamo is a stereotype, this time of Russia's youth in the 21st century.
In Ghost Rider, it's revealed that every country has its own Rider, and each is tied heavily to local folklore and legend. The British rider is based on Spring-Heeled Jack, the Rider stalking Frankfurt for evil to punish is "shock-headed", the Rider protecting the shores of New Zealand is a Maori warrior, the Japanese rider is a bosozoku gang member with an oni motif, with even the American riders throughout the ages seem to encompass little more than era-specific tough guy stereotypes, including a vengeful Native American rider in the early 1800s, an entire Ghost Rider tank crew in WWII, trucker Devil Rig and muscle car enthusiast Hell Driver in the 70s, the hard-drinking Southern badass Penance Fist in the 80s, etc. Let's face it, considering how badass pretty much all of the above are, it might be an example of how to do it right.
The 50 States Initiative gave every state its own superteam, and they tended to be arranged along these lines.
The Rangers, Texas' team, features three cowboys, a Native American legacy hero, a Latino armadillo man, and a Latina with fire powers.
Utah's team, the unseen Called, are stated to all be Mormons.
Hawaii's Point Men includes a new age hippie, a guy with sand powers, a volcano guy, and Stingray, etc.
California's The Order. Two actors, a pop sensation, a baseball star turned entrepreneur, a war hero whose story was turned into a movie, the daughter of two punk pioneers... Do you get that this is America's elite yet? Mulholland Black is especially notable in this case, being named (and that is her real name) after a street in Los Angeles and formerly having been in a gang called the Black Dahlias (after a famous Hollywood murder case). And her powers are that she is psychokinetically linked to the city of Los Angeles itself, drawing power directly from it and its people.
Angel the WASP seems to qualify, although not by any offensive means.
Originally, American Eagle fit this trope — aside from being a beneficiary of happy, shiny comic-book radiation rather than a Magical Native American. Then "Depending on the Writer" helped him escape from the trope. The modern character averts the trope pretty well - he's a Native American who happens to be super-strong rather than a stereotype. (He's also such a minor character that few readers remembered him, up until his Curb-Stomp Battle with Bullseye during Marvel's Civil War.)
Minor Eternals character Ceyote is another example of a stereotypical Native American. His bird-themed costume includes a masked, horned war bonnet with trailing feathers.
Isaiah Bradley, grandfather of the Young Avengers' Patriot, is basically what Captain America is, but for the black American community (his origin even involves the same government program). When he shows up at Black Panther and Storm's wedding, Falcon, Luke Cage, and Bill Foster are speechless; Wolverine has no idea who he is.
Scarlet Witch, if you think about it. She's Romani (half, after we learn her father is Magneto) and has the power to curse people. Not helped by the period where she was dressed up in a stripperiffic Romani-inspired costume.
(Ireland) caught on though she was mainly used as a comedy hero.