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Kaname Madoka from Puella Magi Madoka Magica and Nakano Azusa from K-On! have a broken line for mouths.

Kaname Madoka

Nakano Azusa

Why do characters in some art styles have a broken line for mouths? The lines are broken unless it defines lips but I don't know otherwise.

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    I've got a way to answer this - I just need to reread my old research paper. It's going to be extremely pretentious but I find it interesting. Answer inbound.
    – anonymous
    Commented Jul 4, 2015 at 20:50
  • +1 Good question. I've always thought this style looked incredibly stupid and distracting. I'm curious what the actual reason behind it is.
    – Cattua
    Commented Jul 4, 2015 at 22:03
  • it looks better because the anatomy in anime in not like real life and they make it more simple by making the nose a line and the mouth not connected.they are some anime or manga that have more realestic style like death note and jojos bizzare adventure .
    – user34851
    Commented Jul 27, 2017 at 19:44
  • Why it looks better? Are there any studies/references behind it? You also mentioned that there is a more realistic style on Death Note and Jojo's Bizarre Adventure, does it mean that they don't look better?
    – Aki Tanaka
    Commented Jul 27, 2017 at 19:51

4 Answers 4

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I think the explanation given in moegamisama's answer is a step in the right direction; however, an argument purely from high-level principles about moe/cuteness lacks sufficient explanatory power to explain why this particular style ("broken line" mouths) is often seen. I think a more mechanistic explanation for why mouths are drawn this way is also necessary.

Taking for granted that the minimization of some facial features (a small nose, compensated by large eyes, say) is a common feature in "moe" character design today, and observing that the mouth is an oft-minimized feature, the mechanistic explanation, then, is as follows.

Take a close look at the way Madoka's mouth is drawn in the picture you posted. You will notice that the thickness of the line that represents her mouth is not constant. Rather, it is thickest near the edges and becomes thinner as we approach the center of her face. The line "breaking" at the center of her face strikes me as an artistic convenience: rather than drawing a super-thin line there, the artist simply omits the line altogether, and the viewer's mind merely fills it in (this is the so-called "principle of closure" of gestalt psychology). You see the same thing (albeit less delicately) in the picture of Azusa.

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    But to understand why there's a broken line,doesnt it describe where the lips are located?
    – Daniel
    Commented Jul 5, 2015 at 8:01
  • @Daniel I don't think it has anything to do with the lips. Look at theimperialolive.com/wp-content/uploads/2015/02/lips.jpg: real people's lips are actually thinner at the edge and thicker at the middle, the opposite of the moe characters' mouths.
    – Torisuda
    Commented Jul 6, 2015 at 1:38
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In short, this choice is likely because it makes the character look "cute."

However, why exactly does this make the character look cuter? To understand, we'll have to take a look at the aesthetic theory behind moé.

Some central components of cuteness are, according to Sianne Ngai (professor of English at Stanford who has done a lot of research into aesthetic categories) "smallness...incompleteness...and vulnerability." Ngai cites Hello Kitty as an example of this, noting that Hello Kitty's complete lack of a mouth creates a kind of "power differential" which is appealing to consumers.

Source (Note: you can't read the full text here without paying for it).

These qualities are similarly expressed by an incomplete mouth. This, in addition with very soft lines and colors (compare these character designs to anime like JoJo's Bizarre Adventure) creates a childish and defenseless aesthetic.

This aesthetic can be used for a number of purposes. For instance, the characters in Madoka Magica (noted in the question) were likely designed to emphasize innocence and powerlessness in order to create contrast with the dark atmosphere of the series as a whole and evoke pity or sadness from the viewer.

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  • But what about what I said if defines lips?
    – Daniel
    Commented Jul 4, 2015 at 21:20
  • I think my answer may have been a little broader in scope than you were hoping for (sorry about that). To some extent this stuff doesn't have a concrete reason. We can guess all day about stylistic reasons and aesthetic choices, but in the end, sometimes this just comes down to an artist drawing something and thinking it looks good.
    – anonymous
    Commented Jul 4, 2015 at 22:19
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In reply to Aki Tanaka's comment, it doesn't look better, but it looks cuter. Also, the big eyes make it look cute because of all the highlights in the eyes.

Death Note style works for the anime because of the genre and theme of the show. It is a dark and gritty show. You don't want see happy anime girls killing a bunch of people with a notebook.

It also helps the animation. If the animator is drawing the face of Light Yagami from Death Note or Jotaro Kujo from JoJo's Bizarre Adventure, then it would take longer frame by frame. However, if the animator is drawing the face of Maka from Soul Eater, it would not take that long.

I think the mouths are like for the same reason to draw it faster. The references probably from young girls because their lips are not that big.

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    "You don't want see happy anime girls killing a bunch of people with a notebook." I think you haven't watched Puella Magi Madoka Magica which the first character on the question comes from...
    – Aki Tanaka
    Commented Feb 8, 2018 at 2:18
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From a reddit user:

Ends of the mouth create a cavity in real life, often causing the said part to be more shadowy, while shut lips create a more even surface, resulting in even light distribution. You can even observe this in realistic drawings.

Now translate this into lineart, and you get emphasized ends and leaving the middle empty strengthens this as the brain completes it anyway. It looks pretty attractive too, IMO.

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