When a Cheerful Child is being cute, often they'll have what appears to be blush on their cheeks, except that instead of being drawn as a circular gradient like you might expect, the blush appears as a flat horizontal oval with little or no shading, almost as though they just put a sticker on their cheek. Sometimes the blush even goes past the edge of their cheek and sits half on their cheek and half in the air.
A character may have one or two Blush Stickers regardless of whether it's symmetrical. Sometimes, blush stickers are even permanent. It's also popular on dark skinned characters whose blush might be otherwise hard to see.
Compare Luminescent Blush.
Either one might be used to indicate drunkenness or even arousal in hentai.
Ed (pictured above) and her online avatar both get a pair of Blush Stickers.
Wen from the episode "Sympathy for the Devil". Before the gate incident...
Ojamajo Doremi: Hana has them all the time until she grows up; and when she uses magic to switch places in a Naisho episode, these appearing on Pop makes it clear what just happened.
Subverted with Chao Lingshen. What appears to be Blush stickers are actually part of a Tron LinesMarked Change, and the rest is just under her clothes and hair.
Also Zect, who is a very old and powerful demon, easily recognized as such by denizens of the magic world.
Love Hina: Shinobu occasionally has them, and Su has them all the time.
Pani Poni Dash!: Just about everyone, especially in their chibified forms; it's normally seen with Mesousa, however.
A defining trait of Luca from Macross Frontier. He loses them as the show becomes drastically more serious, befitting his new, somber attitude. He regains them when the SMS Macross Quarter joins the final battle and Ozma takes him back under his wing.
has them permanently equipped. Except when telling Accelerator he doesn't suck and later when dying of some kind of computer virus.
Mrs. Misaka also has these in season 2 when she's harassing Accelerator while drunk. It's because of the blush stickers that Accelerator realizes her resemblance to Last Order.
The main character of Kamichu! has these a lot of the time, too.
Niea and Karna from Niea 7 have very prominent ones, which seems to be an alien thing.
Maggie Mui in RoD the TV gets these regularly. Interesting, as she's the tall, quiet one of the sisters.
Hanaukyō Maid Tai La Verite. Multiple characters in multiple episodes when they're embarrassed.
Kurogane of all people gets one here when Syaoran suggests they steal a book holding one of Sakura's feathers. Much like Fai's example earlier in the chapter, it seems to be a sign of boyish mischief more than anything else.
Pops up a few times on the more comedic characters, especially Larry Butz.
Incongruously, the aptly-named Wendy Oldbag also shows them whenever in fangirl mode over her latest celebrity obsession (and Edgey-poo).
Your daughter in the fifth installment of the Princess Maker series sports a pair of these. Oddly enough, there are times in which she actually blushes.
Blushes of the Summon Night series are always of this sort.
In the opening animation for the PS2 version of Arcana Heart, the whole cast showcases this trope.
Kanisawa Kinu, from Tsuyokiss, has these permanently.
In The Legend Of Zelda Spirit Tracks, Link gains some, although they are only visible on his map sprite-symbol and in certain cutscenes. This is the second notable trait that sets him apart from the, otherwise identical, Link from The Wind Waker, the first being the lower pitch of his voice.
In Persona 4, Ayane. To the point where it's a fandom joke that every time she actually blushes, she's closer to evolving into a Pikachu.
Many Pokémon, especially of the Fairy egg group. Clefairy and Pikachu are most noteworthy of the lot, being the original and ascended fanon franchise mascots, respectively.
Almost everyone in EarthBound and its sequel Mother 3 has this all the time.
Toroko from Cave Story has these permanently on her both cheeks. Ma Pignon has a permanent one on his left cheek.
In Team Fortress 2, the Pocket Medic is a little team-colored Medic doll that sits in a pocket stitched to the Heavy's vest or the Soldier's fatigues, complete with a smile and blush. Isn't he cute?
Phantom Brave has Marona, Carona, and Castile, who all have very faint ones in most official art featuring them.
Brain POP: Tim in the "Stress" video... Although in that case it was due to, well, stress.
Web Comics
Michelle Flammel from Monsterful is an exaggerated example, she's an Homunculus girl with a permanent blush as one of her trademark features, this blush may even be combined with a different blush to create a Double-Blush when she's actually feeling shy or nervous.
Most of the characters in Shortpacked! have permanent ones. Mike's only show up when he's drunk.
Alaska from Destiny Fails Us displays the blush stickers in almost every comic she appears in. Other characters may display blush stickers at various times.
Western Animation
Avatar The Last Airbender actually used this in "The Desert" to show that the main cast were dehydrated.
