Birthmark of Destiny

Vanquishing evil is actually pretty easy: just grab a Chosen One, give them a sword (or just a herring -- Chosen Ones are a very resourceful lot), point them in the right direction and just wait until the evil empire falls. In fact, the only challenge in this puzzle is figuring out just who and where the Chosen One is in the first place. You don't want to end up with a Fake Ultimate Hero, after all.

Well, worry no more!

For your convenience, the gods were nice enough to physically label your Chosen One in some way. Typically, this comes in the form of an unusually shaped birthmark or strange hair/eye color. For bonus points, there will often be a vague allusion to this mark or phenotype that will only make sense once the Chosen One actually appears.

A subtrope of Distinguishing Mark

Anime & Manga

 * Fakir from Princess Tutu has a scar-like birthmark across his chest that indicates that he's the reincarnation of the Knight from the story The Prince and the Raven. Unfortunately for him, instead of being the Chosen One, this means that his predicted fate is to die painfully without accomplishing anything of value. Naturally he decides to Screw Destiny.
 * Kinnikuman has the Kinniku family birthmark on his buttock. He presents it in the Scramble For The Throne arc to prove that he's the rightful heir, only for the impostor princes to reveal their own birthmarks on their backs.

Comic Books

 * The protagonist of the French-language series, Le Scorpion has a scorpion-shaped mark on his back, from which he derives his name. Because of this mark, some people consider him to be the Devil's son.

Film - Animation

 * Madagascar: Escape 2 Africa: Alex is identified as Zuba's missing son by the Africa-shaped birthmark on his paw.

Film - Live Action
"JB: I've had this birthmark since I was born. It's the name of our fuckin' band, dude.
 * The Fifth Element - The eponymous Fifth Element, Leeloo, has the symbols for the four elements on her wrist.
 * Willow - The movie introduction details this trope, exactly, right off the bat.
 * The Court Jester - The Rightful Heir (still an infant) has a birthmark on his butt. There are a couple of scenes of Hawkins holding the infant in his arms, lowering the swaddling clothes just far enough to reveal the birthmark.
 * Damien in The Omen, of course, bears the Mark of the Beast (hidden conveniently beneath his hair).
 * Tenacious D in The Pick of Destiny: JB and Kage have matching birthmarks, one says "TENAC" and the other says "IOUS D"

Kage: I have ass-mark, too."


 * Subverted in Buffy the Vampire Slayer: she had it removed.
 * Subverted in The Golden Voyage of Sinbad, when Ms. Fanservice's eye tattoo is seen by the savage tribe. The Comic Relief guesses that they're so excited because they think it's a Birthmark of Destiny that brands her their goddess, but the character who knows their language reveals that, no, it's actually a sign she should be given to the local one-eyed monster.

Literature

 * In the Discworld series, Carrot casually mentions having a crown-shaped birthmark, which marks him as the rightful heir of the Ankh-Morpork throne.
 * Invoked in Wyrd Sisters, when the witches talk about a "strawberry birthmark", despite there being no evidence the lost heir does have one. And nobody's entirely sure what it even means; Nanny Ogg seems to vaguely think it would taste of strawberries.
 * One of the Jedi Apprentice books had this, only the birthmark would only appear in a certain chamber. This revealed that the Crown Prince was not actually the rightful heir, instead the heir was the king's daughter from a previous marriage to a commoner. Who also happened to be the leader of La Résistance.
 * Morgon in Patricia McKillip's Riddle Master trilogy has three star-shaped birthmarks on his forehead.
 * Deyna's birthmark in The Taggerung. It's a flower-shaped mark on his pawpad, foretold by a seer to mark him as the titular Taggerung (a creature destined to become an unstoppable warrior). This allows the villains to know they've got the right baby when they kitnap him for the honor and strength of their clan.
 * In The Outlaw Of Torn by Edgar Rice Burroughs, Norman of Torn has a lily-shaped birthmark on his right breast, which eventually proves that he's Prince Richard, lost heir to Henry III.
 * The royal family in the Hero Series all have a royal birthmark indicating as such.
 * In The Prophecy of the Stones, the gift of hope, which allows the protagonists to defeat evil, has been passed down through the generations, with the carriers of hope bearing a sun-shaped scar on their palm.  reveals at the end that she has such a scar, which connects her plotline to the main one.
 * In The Belgariad, Garion has a discoloured mark in the shape of a circle on one of his palms.
 * Sorcerers also have such a mark somewhere. Polgara's is in her hair.
 * Among the Ulgo people, the one destined to become their holy man is known by the colour of his eyes at birth.
 * Discussed in Artemis Fowl: The Atlantis Complex. Orion wants Foaly to help him search for one. Foaly is not amused.
 * A main plot point of the childrens' series Dragonblood, which centers on kids born with a dragon heritage who can usually transform into dragons. They all have a dragon-shaped birthmark on their arm.

Live Action Television

 * On the original Doctor Who,  was believed to be the Chosen One by his adoptive people, due to a distinctive mark on his shoulder. Subverted in that it wasn't a birthmark or a mark of Destiny, but.

Music

 * In Anna Russell's "How To Write Your Own Gilbert And Sullivan Opera," the fat contralto character of Dandelion reveals (in song, assisted by chorus) that the rich tycoon Claude Billy Bunion was born with a mark "just like a Spanish onion" behind his ear, but being a stupid Gilbert and Sullivan character she switched the bassinets. Such a mark is discovered on the tenor, whom the soprano can now marry instead of the patter baritone, who has to marry the contralto.

Radio

 * Parodied in The BBC radio series Hordes Of The Things (yeah...), where Prince Veganin is told that he bears the birthmark of the High Priest of Zylbor (just after he's slain the old one). Turns out that he's not the only one with the mark, however: the Priests are collecting birthmarks from every possible claimant and throwing away the rest of their bodies, on the assumption that they'll be able to fit all the pieces with birthmarks together into their new High Priest one day.

Video Games

 * Certain incarnations of Link from The Legend of Zelda have a birthmark in the shape of the Triforce on their left hand.
 * In Fire Emblem's Jugdral sub-series, Word of God says people who possess holy blood (Indicating they are among the oddly rare decedents of the legendary Crusaders) and if they can or can't use the associated legendary weapon shows up as a birthmark (In game it just shows up on the stats screen).
 * The Branded from Path of Radiance and Radiant Dawn are this.
 * In Umineko no Naku Koro Ni, Kinzo's polydactyly was interpreted as a sign that he was destined for greatness, which is why he was put in charge of restoring the wealth of the Ushiromiya family.
 * Ecco the Dolphin has a group of star-shaped marks on his head that some in the pod say look like a constellation in the sky.

Webcomics

 * The lesbian pirates in I Was Kidnapped By Lesbian Pirates From Outer Space have been scouring the galaxy for years trying to find their lost princess who was stolen at birth. All they know is that she has a peculiar birthmark on her belly.

Western Animation

 * On The Simpsons, the Stone Cutters (who are totally not the Freemasons) go from heaping punishment on Homer to making him their god when they discover a birthmark on his butt is shaped like the Stone Cutters' symbol.
 * Rocky and Bullwinkle: Bullwinkle has one of these on on the bottom of his foot/hoof. It's subverted at the end when it turns out that it's actually the design on his bathroom floor mat, imprinted when he stepped out of the tub.
 * And double-subverted when he later reveals that he has another one on the sole of his other foot that won't wash off.
 * In American Dragon Jake Long, members of the Huntsclan have dragon-shaped birthmarks. According to Rose, before her Heel Face Turn, it destines her to slay dragons.
 * Teen Titans gives Raven glowing red birthmarks in the shape of occult-looking symbols all over her body as a sign that she is the daughter of/portal for the demon Trigon. However, these marks are normally invisible and only appear when Trigon is stirring (i.e. only when they're relevant to the plot).
 * Subverted in an episode of Sagwa the Chinese Siamese Cat where Sagwa's younger sister Sheegwa is thought to be a princess because of a star-shaped birthmark on her body, but at the end of the episode the "birthmark" is accidentally washed off and is revealed to be just a stain of mud.