What is your character design pet peevee?

@CelestialNavigator Fun fact, actually, in regards to your number two. The reason why superheros are traditionally drawn with underwear on the outside of their pants is because of the limited capabilities of color printing back in the day. They couldn't print in a great amount of detail, as printers there put down one layer at a time (black, yellow, red, blue, not necessarily in that order) and so the edges didn't always line up, which meant that if a character had a lot of detail on them, it would get blurred in a good number of issues. However, they still needed to have some color and lines to break up the overall jumpsuit design, so they popped a pair of panties over everybody's pants and boom, you've got a bit of design interest and color and line work all in a neat little package.

Now my main character design pet peeve is seeing sci-fi designs that don't have any explanation or visual cues as to how they work. To me, Sci-fi is meant to show a reality in which a theoretical/probable part of science (like wormholes in interstellar) is available to people and what this might mean to the fictional society, or how it might affect how society evolves and how the characters deal. So if, say, you've got a character that can summon up fire in their hands, I want to know HOW. I don't want handwavium, I want to either see tubes and a fuel tank, or some explaination as to how and why they can do what they can do.

I also really dislike it when all the characters in a series conform to a single standard of beauty. Big boobs and trim eyebrows for ladies, tall, buff, and not partiuclarly emotional for men, that sort of thing. It's boring to me.

Lastly, I really, really hate it when no thought is put into the colors and values used, especially when those things are super saturated. I want things to be separated according to some manner of design, be it shadows or the opposite hue, because otherwise I get lost in the design. Either that, or my eyes get burnt out via too many saturated colors.

In regards to the sci-fi thing, I think that there are different sub genres and that a preference for one doesn't make the other flawed or have bad design per se. What you might prefer is whats called hard sci-fi which tends to be a lot more technical in terms of explaining the world. Michael Crichton's techno-thrillers (Jurassic Park, Prey, Andromeda Strain, etc) are an example. But I think there's plenty of room for "black box" sci fi where you don't have to know how it works to enjoy it. Steins: Gate and Star Trek are good examples of this.

seems like people really dislike the color pink. there's a comic based around that specific color too and i don't really mind it. https://tapastic.com/episode/2650596

It annoys me when characters are drawn with 4 fingers...

Agreeing with @savannah about the 4 ears thing, and with others about boobs with their own weird physics.

While Stargate is another example, all I have to say is, dude.
This:

My main pet peeve is over designed characters. For sci fi they put tons of "lines" (like seams or something) through out the clothing, typically one piece suits. It messes up the composition of the body making your eyes go everywhere. The new power rangers movie is a great example.

And then there's anime. Bows, ribbons, sparkles, frills, more bows, ribbons, sparkles and frills. If your character fights then there has to be a point where practicality meets reality.

Hmmm... I can be VERY picky about design choice. designing characters has to be easily readable for me. at first glance you can perfectly understand what your looking at and it doesn't need to be overly complicated. having any sort of unique traits the character may have will also help. I think this way your character will be easily remembered!

here's some examples of characters I made. Just to understand what goes through my mind I suppose. I don't like designs to be overly complicated. I guess that's my pet peevee.

Oh, a few things. These are all very personal opinions, and if you disagree, it doesn't mean I think you're wrong; it just means we like different things.

• Overtly sexualized clothing design on women where that sexualisation is out of place. If the purpose of your comic is to portray a sexualised atmosphere in general, or plain erotic fiction, or if the woman in question is flirting with someone and/or about to have sex, then sexualized clothing is just fine. When it's a woman existing in a situation or scene where sex would not factor into her thinking at that time, it makes no sense. Women going on an adventure to fight monsters would not wear miniskirts and bikini-tops. A woman in a professional office setting would not be showing off her panties. When a female character's clothing is drawn ONLY because "hurr hurr boobs" in a setting where that would not make sense, it is blindingly obvious and silly, ESPECIALLY if all male characters get to be fully clothed. NOTE: There is a difference between characters wearing shorts skirts or cute clothes, and characters who are overtly sexualised. A girl in a sundress on a summer day = makes sense. A crusading warrior woman in a metal thong = now you're just being silly.
• Gravity defying hair. I don't mean a few cow-licks, or the standard spiky anime-main-character-hair. I mean Sephiroth-bangs. The hair that defies gravity in preposterous ways, and then suddenly obeys it again. It's common in anime and manga, especially on a.) silver-haired bad guys, and b.) the genuine love-interests in harem mangas like Love Hina. I don't know why it grates on me so much, but it does.
• Zippers on all the things. I'm looking at you, Kingdom Hearts.
• Clothing design that is clearly coded as "good" or "bad", unless it's done with parodic intent or with the creator's awareness and conscious approach of the cliché. Evil characters wearing black and red and being covered in spikes and giant skulls, etc. Good characters wearing all white, etc.
• Addition to the previous point; anything that visually codes "virginal" or "innocent" visual cues as morally good, and sexy or sexual availability as morally corrupt and/or evil. It might SOUND like this is a counter to my first point, but I have nothing against sexy characters, or sex in general^. What I object to is the idea that virginal and innocent women are somehow better, morally, than women who have/have had sex at some point. It goes against my personal feminism.
• Ill-conceived colour schemes. Mashing a bunch of very loud colours together, or turning your character's costume into 50 shades of muddy brown - whichever end you come at this, it doesn't usually work for me. SOME people can make bright neon colour schemes work together, but it takes a lot of thought, and it's usually a bad idea.

^.) I'm on the asexual end of the spectrum. What other people find attractive is very literally never going to be my business.

... I have hair that long. ^_^; I know not everyone has that kind of hair-length, but for me, hair that long isn't unrealistic. As a result, a lot of my characters have long hair!

To clarify my point to those who might have misunderstood; I'm not saying that wearing sensible boots to go fight a dragon is equal to coding a character as virginal and virtuous. What I'm talking about is pretty well exemplified in this image of Mary Marvel:

These women are both the same character; on the left is Mary Marvel when she is morally good. She's wearing all white and gold (white being culturally associated with innocence and virginity), with loose-fit sleeves, more flowing, cotton-y fabric and a more child-like cut to her clothing. On the right is Mary Marvel after she has been corrupted and gone evil; her outfit is now mainly black, and seems to be made of latex or shiny leather, she's got garters, fishnet stockings and shiny leather boots - all of which are often associated with sex and sexualised clothing. The lower half of her outfit is basically sexy lingerie, and the top half isn't much better.

So, this costume change equates moral goodness with child-like innocence and virginal visual cues, and moral evil with sexy lingerie and sexual availability.

This is the most obvious example I can find on short notice, but it's certainly not the only one - it's quite common. I'm really not fond of it.

that shit-eating face just totally makes it even funnier lol (even though i'm guilty of this to a point)

I would say the typical anime-girl-in-sailor-uniform trope. Also, defining the main character by their bright hair color (usually pink or blue or something weird like that).

Already mentioned but yeah, I'll have to agree with the unreasonable cleavage type , and as a fan of Bleach and shonen in general, boy have I had my share of those. Especially on characters that are portrayed as innocent, child like and not sexual personality wise. I am all for fan service, characters like Jessica Rabbit was designed with that in mind, but I don't like it when I see it on characters whose mind set and personality do not go hand in hand with the design they were given (if that makes any sense.)

Also Goku-like hair. The people who first had to create a 3D model of him for the games or figures must have had a field day.