The lightning bolt earpieces on the side of the The Flashs head are more or less prominent depending on who's drawing him. They're either thunderbolts (usually Wally, almost always Bart), Hermes wings (usually Barry, always Jay, as he wears a helmet) or T-shaped earpieces (seems to be a Scott Kolins quirk).
Speaking of the Flash, how Bart Allen's hair is drawn also fluctuates wildly. As Impulse, it's generally big and bushy; as Kid Flash, his hair is shorter. Sometimes it's depicted as brown, sometimes it's red. Bart was also slightly taller and a bit more muscular when he first appeared in the Flash title, and his hair was loose and shoulder-length. Later artists depicted him younger and with shorter hair, until it evolved into that large bushy style. His body also became more gangly, and Humberto Ramos popularized the "huge hands, huge feet" look which stuck with the character up until other artists drew him less stylized as Kid Flash. Bart's eyes were also usually yellow, but later colorists would slip up and give him brown, or even green (like Wally West).
Wally West's hair colour is either full-on red, orange, strawberry blonde, or just outright blonde (like Barry Allen) depending on who's drawing him. Similarly, his eyes are canonically green, and are depicted as much usually, but he's also frequently drawn with blue eyes, again just like Barry. His costume varies as well. The one consistent thing (once he changed it), is that his belt is pointed downwards towards his crotch, rather than the completely horizontal lightning belt that Barry Allen used. Sometimes the eyes are whited out, sometimes they aren't. Sometimes his costume is a darker red than Barry Allen's, sometimes it's just as bright. Sometimes there's a yellow circle around his symbol, sometimes there's not. There's kind of an in-universe reason for this, in that Wally eventually learned to materialise the costume around himself and alter its look, but at times, that can't apply and the artists just choose whichever look they prefer.
The Flash (Infinite Frontier) saw Wally go back to a classic Flash suit to present his return as the main Flash, but outside of Blank White Eyes, for a while the suit he's wearing can either be the one he wore in the early-to-mid '90s or a lighter version of the one he took up at the end of The Flash: Rebirth. Between Fernando Pasarin taking over as the main artist and various guest spots, the latter eventually won out.
Pied Piper's hair color has been every shade of red imaginable, ranging from auburn to straight-up blonde.
Similarly, Captain Boomerang started out with thick, balding brown hair which progressively turned into sideburns of varying length. Then his hair turned red after his resurrection at the end of Blackest Night, matching his son's color. Since then, it seems to have become his official hair color, but a few artists still depict him with brown hair every now and then.
Pre-Flashpoint Captain Cold was fairly consistently depicted as an older man, with the amount of wrinkle the only notable variation. But in the New 52, he and many other characters got an Age Lift. Then, DC Rebirth attempted to merge the two timelines and keep the best of both worlds. Artists, however, don't seem to agree on just how old he is supposed to be these days.
Evan McCulloch is by far the worst offender of this trope. He's only appeared unmasked a handful of times, but none of those appearances has been consistent, making him look like a middle-aged, balding man in one issue but a handsome twenty-something in another. His tooth gap also comes and goes as artists tend to just forget about it.
While starting out as a simply green-skinned human for most of the series, later artists tried to emphasize the "beast" in Beast Boy's name. Mike McKone started by giving him pointed ears and fangs (as an homage to the animated Titans), while artists following him would depict Gar with huge sideburns, a wider jaw, claw-like fingers and toes, and often let him go barefoot. Some artists also liked depicting him with copious body hair, while others left the detail out.
As originally drawn by George Perez, Raven's face was rounder and softer-featured. As he continued to draw her, he decided to make her appearance stand out from the other two women on the team. She wound up developing a more narrow face with visible cheekbones, larger lips, and a rather high forehead. These changes were later noticed in "The Terror of Trigon" arc. After Perez left the series, Eduardo Barretto gave Raven a look more akin to Perez's original style, though later artists would give her back her narrow features.
After her resurrection in TT volume 3, she appeared as a younger teenage girl, though fans of her classic appearance decried some artists' choice in giving her larger breasts as a way of making her sexier. The "new" Raven also seemed to alternate between looking in her mid-late teens to looking a little closer to her '20s.
The second version of "Evil Raven" in the '90s also had her appearance shift about a lot. Did she have antlers like her father? Was her skin red or simply a deep tan? Did she have four eyes or two? A gray streak in her hair or not? The extent of just how revealing her clothes were was yet another of these many variables.
Raven's first dress and cloak were later mentioned in dialogue to be "black", after she made the switch to her white outfit. Yet in actuality, the dress and cloak were depicted as blue, possibly to save on black ink and as a stylization choice. Most modern depictions of Raven keep the outfit blue, although in a darker shade (though a pin-up for the volume 3 "Secret Files" depicted her dress as a violet-highlighted black).
Starfire's hair started out infamously huge and red, while her eye shape was more on the rounded side. Certain artists past volume 3 would sometimes give her narrow eyes and portray her hair much straighter, and colorists would occasionally give it more of an orange or brown hue. Her flaming hair-trail changed from looking more like an extension of her own hair, to actual bursts of fire. Her skin has appeared either more on the golden side, or more saturated of an orange tone.
Rose Wilson's eyes have shifted between being green and blue, depending on the colorist (back when she had both eyes). She's also supposed to be part-Cambodian (at least in pre-Flashpoint continuity), but she's often drawn a bit too Caucasian-featured for some of her fans' comfort.
Miss Martian alternated between being a smaller-built girl with average bust size, and at times having a much larger chest. Colorists also couldn't decide whether her eyes were green or magenta, and the style of her boots and gloves were subject to change.
The '90s Titan Pantha had her unmasked face subject to much variation. Some artists preferred giving her a more animalistic look, with a snubbed, snout-like nose and pointed earlobes. Other later interpretations showed her with a more human face, with her simply having irises like a cat. The color of her sclerae and irises were also never consistent.
While the amount of cleavage shown in a superheroine's costume is always a variable, one character that tends to get hit very hard with it is Donna Troy whose cleavage varies from modest to Navel-Deep Neckline from artist to artist.
Her costume's Stripperificness depends on who's drawing her today, particularly her shorts. This doesn't only apply to formal costume changes — it also happens in comics supposedly taking place at about the same time. Wonder Woman's briefs usually cover her crotch up while in other comics, they barely cover her vulva◊.
Despite having so little material to work with, the nature of Wonder Woman's outfit varies wildly artist to artist. Is it an bustier and shorts combo, a one piece strapless leotard or a strapless bathing suit in form? If she does wear separate tops and bottoms the bottoms can still range from hot pants, to panties, to biker shorts, to skirts, to culottes that merely look like a skirt at a glance, to pteruges that happen to look like a skirt at a glance. Then there's her golden Chest Insignia, which was originally an eagle that took up everything above her culottes but has since been portrayed as just taking up most of her torso before "perching" on her waist or just taking up a small amount of her chest to leave room for a WW belt. Sometimes there's a single W on her chest and another W for her belt and sometimes just WW Chest Insignia with the rest of her top left plain red until it reaches the blue bottoms spangled with white stars. Some artists even combine her two golden chest insignia by stylizing the eagle's wings to look like W/WW, and for the large majority of New 52 Wonder Woman's golden insignia was instead silver.
Wonder Woman's footwear has ranged from boots to sandals. The boots have been everything from plain red, to red with white stripes, to red with gold points, or with golden "Ws" at their tops. Boots or sandals, her footwear was originally high heeled but have increasingly been drawn flat soled. Her bracelets were originally just that; tiny dark grey bracelets. They have since alternated between large silvery wrist guards, silvery vambraces or proper silvery bracers. Her tiara has also varied wildly in size. Her head piece usually has a red star on it, but following the live action film it has sometimes been drawn pure gold with some other kind of design imprinted in it.
Her nemesis Cheetah also varies on whether she actually has fur or just a cheetah pattern on her skin. Also in just how bestial she looks; she may be a sexy catgirl, a snarling, spitting were-beast or somewhere in between.
Wonder Woman's nose is inconsistent. Young Justice, the Wonder Woman movie, and more than a few comic book artists give her a large, 'Greek' nose while others favor a smaller nose.
Does Wonder Woman have straight hair or wavy hair? If the latter, just how wavy is her hair?
Wonder Woman's musculature, much like She-Hulk and Power Girl, fluctuates depending on the artist, sometimes she's pretty skinny◊ albeit somewhat toned whilst in other comics Diana◊ isjacked.
Her friend Etta Candy started out as significantly overweight yet tall in her debut, and had blonde hair. Her height soon shrunk through her Golden Age appearances, to where she usually was seen as short and fat, and with red hair. In the Holliday Girls' brief return in the '60s, her weight was somewhat reduced and her uniform was changed to have a modest skirt instead of short shorts. Later portrayals of Etta (pre-New 52) depicted her as a taller woman, either actually a bit overweight or simply Hollywood Pudgy (and either confident or insecure over her looks in comparison to her idol's). After Flashpoint, she's since undergone a Race Lift and become much more slender, but she takes on a more heavyset power lifter look in DC Rebirth.
Her Post-Crisis hair color had alternated between being brown, red or blonde, along with the varying depictions of her weight and her eye color (which could be either blue, green or brown). In George Perez's run, her weight changes were an addressed plot point, while depictions afterward were up to the artists. The artists during Gail Simone's run on Wonder Woman tended to favor a tall, curvy, blonde-haired Etta, while the Etta in the Flashpoint tie-in issues was red-haired and pudgy.
One notable inconsistency was Grant Morrison depicting Etta as a morbidly obese, middle-aged woman with graying hair in their "Seven Soldiers" series, while the Wonder Woman title had depicted her less heavy and with red hair.
While the amount of cleavage shown in a superheroine's costume is always a variable, one character that tends to get hit very hard with it is Donna Troy whose cleavage varies from none to modest to Navel-Deep Neckline from artist to artist.
Mnemosyne the Amazon's chief librarian and historian has been drawn as a blonde and a brunette.
Other
52: Every issue had pencil layouts done by one artist, Keith Giffen, in order to keep this trope to a minimum. However, there were still a few minor slip-ups, the clearest example being Renee Montoya and Kate Kane. They were well-endowed but realistic when they first spoke to one another (They were still gorgeous, but it was manageable), but when they met in the park in the next issue they were both bulging out of their tops. The commentaries usually passed it off as exactly this trope, and not a deliberate attempt to titillate readers.
Animal Man: The emblem on Animal Man's chest can either be the letter A or an arch shape that merely resembles an A. The shape of his goggles also seems to vary.
Aquaman: In Aquaman: Sword of Atlantis, depending on who's drawing him, Arthur looks anywhere from his late teens to being middle-aged, with the only concrete evidence of his age being "younger than the first Aquaman."
Black Canary: Is Black Canary a natural blonde or not? Traditionally she's naturally black haired but either wears a wig (pre-1990s) or dyes/bleaches her hair (post-1990s), but some artists have depicted her as always being a blonde.
In series after the original Arnold Drake run, Cliff Steele/Robotman would be lucky if his robot body would keep a consistent design for longer than a few issues.
Dorothy Spinner had several notable discrepancies in her physical appearance that changed depending on who drew her, such as whether she wore her hair in pigtails or wore it down, if she wore a blue and white dress like her literary namesake Dorothy Gale or went with less feminine apparel and the severity of her ape-like deformities (one example being when Erik Larsen, Doug Braithwaite and Tan Eng Huat drew her with a high forehead and a prominent brow, features which were eschewed by most other artists who drew her).
Etrigan: Etrigan's height, facial features, and outfit vary wildly. Most artists draw him medium height with a mostly humanoid face and a Primal Stance, but when he guides Dream through Hell in The Sandman he barely reaches Dream's shoulder and has an elongated reptilian snout, and in Swamp Thing he has a harelip. Then there's the endless variations in which way his horns point, what his bracelets and belt look like, and how much leg he's showing. In a subtler example, nobody can decide whether Jason Blood's skunk stripe is on the right or left side of his head.
Green Arrow: Another notorious entry for Ambiguously Brown; Green Arrow II, Connor Hawke. He's supposed to be 1/2 white, 1/4 African-American and 1/4 Korean. Good luck finding an artist who can draw it. Even his skin is wildly inconsistent, as some colorists depict him with a dark complexion to reflect his mother’s African heritage, while others have him looking just as pale as Oliver Queen, his white father.
How the Green Lantern energy aura looks. It's either similar to electricity (Seen on the New 52, mostly), to fire (Seen on the Alan Scott Lantern), to plasma (Seen on Rebirth), to just light. Similarly, sometimes Lanterns have a natural glow around them, or their rings emmit a constant flux of energy, while other times they don't need it and it's more of a conscious choice they do. Guy Gardner canonically has so much willpower than his ring is constantly emanating sparkles because it can barely contain it, but that doesn't stop even rookies from having energy leaking from their rings.
If the rings project a second Lantern symbol above the Chest Insignia and the ring tends to vary too, usually being the case in comics from the New 52.
The Human Lanterns' eye colours. Are they green because of the rings, naturally green, or not green at all?
Does Larfleeze look more like a pig, more like a horse, or even a Baphomet-like demon?
Does G'nort look like an anthropomorphic dog, or Barf from Spaceballs? Likewise, does Ch'p look like a realistic chipmunk or something out of a kid's cartoon?
Sinestro's skin; Purple? Reddish? Magenta? Pink? DOTA. And to a lesser extent, whether or not his ears are pointed.
Not just his ears either, but also the shape of his head. Some artists (and animators) give him a normal "human"-shaped cranium, others endow him with an exceptionally tall forehead (like a less-extreme version of Hulk villain The Leader) that goes straight up, while others still depict more bulbous proportions, with a subtle outwards flare. His resulting hairstyle varies as well, from nondescript short hair, to a pronounced widow's peak, or even a flattop (in Emerald Dawn II). From the advent of forming his own Sinestro Corps he's been sporting a much shorter hairstyle with a shaved undercut befitting his "fascist" look (note the Naziesque armband), to which most artists have since adhered.
Curiously enough though, other Korugarians are almost never drawn with non-human ears or cranial shapes, including his direct blood relatives.
Although fellow Korogarian (and Sinestro's daughter) Soranik Natu usually stays a pretty steady shade of pinkish-purple. This is probably because she (a) hasn't been around nearly as long and (b) only really appears in the Green Lantern books.
Hank Hall/Hawk's build has varied from being simply brawny to full-on Liefeldian beefiness (it doesn't help that the '80s mini-series was drawn by Liefeld to start with).
Artists also waver between showing Hawk and Dove's eyes through their costumes or doing a full-on Batman effect with whiting out their eyes.
Dawn Granger/Dove II started out as an average-height girl who would magically grow to become taller as Dove, while her shorter blonde hair would change to become long and white. In recent years, artists often forget this and portray her height as being the same in both forms and her hair winds up often being colored white in civilian mode too.
Holly Granger/Hawk II: A shorter woman with an average-sized chest or a practical Amazon with large breasts? Was her hair super short, shoulder-length, or was it down past her waist? Her hair color was another variable: Originally Geoff Johns and Mike McKone considered her as a blonde, but changed their minds and had her with pinkish-red hair in her debut (though the colorist forgot to recolor her hair in one panel, leaving her as a blonde). Johns' official profile for her in a Secret Files issue then stated that she had brown hair, yet his draft for the first One Year Later Teen Titans issue described her as a redhead. In her sporadic appearances during her tenure as Hawk, colorists seemed to shift between all three of those colors for her hair, sometimes even in the same event (World War III).
Jonah Hex: The extent of Jonah Hex's scarring varies greatly between artists. He's always got the mouth-string, bug-eye and perma-sneer, but some artists draw him with only those, most artists add some burn scars (The Movie seems to have gone this route) and some artists turn him into Two-Face in a cowboy hat.
Justice League of America: Doctor Destiny got subjected to this during the late 1980s and early 1990s. The appearance Destiny has outside of these? Despite predating the character, you can be forgiven for easily getting Dr. Destiny mixed up with Skeletor.
The original penciller for The Sandman (1989), Sam Kieth, depicted him as completely bald and with horribly rotting, seemingly dripping skin. When Mike Dringenberg took over pencilling duties, Doctor Destiny acquired side hair and lost the rotting skin.
Batman Vol. 1, #492, the first proper part of Knightfall sees Destiny among the inmates listed who escaped during Bane's attack on Arkham Asylum. The late Norm Breyfogle, who drew the issue, went with the McKean/Kieth/Dringenberg depiction with a shriveled face and tufts of hair.
The "Destiny's Head" arc of Justice League America, where it was revealed the Bloodwynd who originally joined the League was really the Martian Manhunter, saw writer/artist Dan Jurgens mix the classic skull face with the long side hair of Dringenberg's depiction.
Cyclone's costume is pretty hard to draw, so various artists raise or lower the slit on the side (or remove it entirely), alter the amount of strips on the leggings, change the size or colour of her emblem, and change how baggy or large the overhanging pouch is.
In The Lightning Saga, a Justice League and Justice Society crossover, the third Wildcat suffered heavily from this trope. When drawn by the JSA artist his musculature was defined but lean, especially when compared to the body of the first Wildcat (his father and a heavyweight boxing champion). But whenever the JLA artist drew him he would suddenly have huge muscles that easily rivaled or even surpassed his father's. This actually becomes kind of funny when reading the trade paperback, since the artists alternated on chapters and make it look like Wildcat II is constantly expanding and contracting.
Artemis Crock's (Tigress') hair changes shades often. It has been various shades of blonde and even light brown.
Lobo: Lobo, at least before Simon Bisley's despiction of him, had his hair and black facial marks (specially those on the side of his mouth and chin) vary a lot.
Martian Manhunter: Everyone is agreed that the Martian Manhunter has red eyes, but their appearance varies depending on the artist. Most of the time they are pure red, with no iris, pupil or 'whites'. Sometimes they have these structures, but colored in subtly different shades of red. Very rarely they will look like human eyes, but with red irises. This variation can be explained by the fact that J'onn is a shapeshifter, which lets the artist off the hook.
Go back before the 2000s, however, and there're comics where J'onn's eyes are solid black. At some point, the red eyes won out decisively, and the black eyes haven't been seen since.
Sometimes all the characters are drawn in a unified style, sometimes Billy/Cap are drawn in homage to C.C. Beck's original cartoony Black Bead Eyes style and the others in a more realistic one.
Freddy Freeman, apart from his New 52 Adaptation Dye-Job that took away his young-Elvis look, has used a variety of mobility aids and had several Limited Wardrobe redesigns more radical than Billy's, some more self-consciously rockabilly-inspired than others.
Black Adam was originally drawn with pointy ears for some reason. When he was introduced to the DCU in The Power of Shazam!, he had normal ears. When that version of Adam appeared in Justice Society of America, he had pointy ears again. Since then it seems to be entirely down to whether the individual artist thinks it looks cool or silly.
Some artists will go out of their way to draw Shazam as an adult version of Billy.
Vixen: Vixen has an odd one in how her powers are presented; she has the ability to take on the abilities of any animal, but DOTA, there may or may not be an aura looking like said animal around her when she does it.
. As Impulse, it's generally big and bushy; as Kid Flash, his hair is shorter. Sometimes it's depicted as brown, sometimes it's red. Bart was also slightly taller and a bit more muscular when he first appeared in the Flash title, and his hair was loose and shoulder-length. Later artists depicted him younger and with shorter hair, until it evolved into that large bushy style. His body also became more gangly, and Humberto Ramos popularized the "huge hands, huge feet" look which stuck with the character up until other artists drew him less stylized as Kid Flash. Bart's eyes were also usually yellow, but later colorists would slip up and give him brown, or even green (like Wally West).
