In many works, especially anime and video games, white hair quite frequently indicates a villain or, at the very least, someone to watch out for. Especially in characters typically too young to have white hair.
Despite the wide range and use of Hair Colors for characters, there's an eerie specificity to the use of white/silver hair when coupled with a pale, handsome, vaguely effeminate face. The (usually long and rarely tied back) white hair is very frequently coupled with redeyes, and often with a dark outfit for contrast.
Compare with Blond Guys Are Evil, Blondes Are Evil, Evil Albino and Light Is Not Good. Compare and contrast with someone who has Mystical White Hair, who is less likely to be evil and more likely to be magical, superpowered or otherworldly.
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Anime and Manga
Yami Bakura from Yu-Gi-Oh! practically defines this trope.
Touma from Aquarion. Bonus evil points for being an angel.
Mykage from Aquarion Evol.Who is basically the embodiment of Touma's hatred.]]
Griffith, the mercenary Captain from Berserk, fits the physical description to a T, a nice contrast to the Conan-like main character, Guts. While officially a "hero", he starts out as a manipulative Magnificent Bastard out for his own purposes, very much like the historical 30 Years War mercenary Wallenstein, who was rumored to have made a Faustian bargain. In this case, though, instead of selling his soul, he sells those of his men.
Creed Diskenth from Black Cat. Creed is not only white-haired, but insane, bloodthirsty, and wants to conquer the world; dude even compares himself to Lucifer. He also has a really creepy crush on Train.
Il Palazzo from Excel Saga is the leader of ACROSS, an organization dedicated to conquering the world. He's also a Visual Kei-wannabe.
Lyon Bastia is an antagonist in Fairy Tail when he first appears in episode 12-18 on Galuna island, where he attempts to resurrect the demon Deloria. He decides to change his ways as he watches Gray set sail.
Mirajane Strauss, on the other hand, seems to be a subversion - she has white hair and her magic is the aptly named "Takeover: Satan Soul", which allows her to take over the forms of demons and use them for herself (it's also implied that the victim of the taking over is completely absorbed into the wizard using it, becoming nothing more than a cool transformation from then on). While her younger self was a violent little hellraiser, she's currently one of the sweetest characters in the series.
The three white-haired dolls in Rozen Maiden, Suigintou, Barasuishou and Kirakishou, appear as villains.
Main character Inuyasha. Humans and youkai hate each other and, as a half-breed, he's hated by both sides. So, he decided to hate the world right back. He begins the story as a villain and ends the story as an Anti-Hero.
Sesshoumaru as well. He's a calm, cold, aloof, and enormously powerful youkai, who starts out as a villain and gradually develops into an Anti-Villain, and then an Anti-Hero, remaining inscrutable the entire time. He's a lot more stubborn than his brother Inuyasha, so his character development takes longer and is more extreme.
Also, Hakudoshi. He's a child version of Naraku, except he won't hesitate to get his hands dirty. He remains a villain to the bitter end.
Muraki from Yami No Matsuei (Descendants of Darkness) is pretty much the stereotype. He's white-haired, good-looking, a sharp dresser with refined tastes. He's also brutally sadistic (not to mention a sexual predator), enjoying psychological as well as physical torture of his selected victims.
Makubex from Get Backers. Silver hair, creepy reality-bending powers, actually a created being. His presumable creator, Makube-hakase, is a White Haired Pretty Girl with actual white hair.
Kuze in the second season of Ghost in the Shell: Stand Alone Complex has a cyborg body with white hair and extremely pale skin. He had the face sculpted by a highly reknowned artist, and it's only capable of very limited facial expressions, because they would distort this piece of art. He even rarely moves his mouth when speaking with his synthetic voice. And to complete the look, he always wears white and a white long coat and often uses a silver katana with an ivory hilt.
Godchild has Jizabel Disraeli, Cain's illegitimate brother and one of his longest surviving enemies. As a child, he was so pretty that his mother hid him from his father by dressing him as a girl. In order to keep him alive, Jizabel's father killed his sisters and transplanted their organs into him. After suffering from his father's abuse for years, Jizabel decided that he suffered from an in-the-blood predestination to being evil and became a doctor who specialized in all manners of unsavory medicine, including deadly crash diets and brain transplants.
Gundam SEED had Yzak Joule, part of Athrun Zala's squad of mobile suit pilots. He also suffered from Minor Injury Overreaction (though, given, it was the result of shrapnel from his cockpit punching through his helmet, and he repeatedly cried out that it burned when it happened, so perhaps it was not so minor at the time), which branched into The Only One Allowed to Defeat You, though it's subverted in that he's humiliated every time he tried and, eventually, his target was defeated by Athrun instead.
Enrico Maxwell from Hellsing starts out as this in the anime. Given the art style and the fact that he's one of the more batshit members of the cast, though, he quickly starts gaining some facial expressions that aren't so pretty.
Rome Ro, the Big Bad in Heroic Age. He's the very last of the Silver Tribe to make a Heel-Face Turn, and he tortured Yuti into attempting to destroy the planet Elysium and, with it, the power of the Golden Tribe.
Leon Oswald, brilliant yet embittered acrobat from Kaleido Star. He humiliates Sora verbally and on-stage, wants revenge against Yuri, seriously injures May Wong to punish her bad attitude, and has a heartbreaking backstory thanks to his dead little sister, Sophie. So yeah, he gets better.
Karoku from Karneval is one, and although the reader is currently unsure of his intentions, he certainly isn't being kind to the boy who sees him as a surrogate older brother figure and is currently seeking him out. He's also either uncaring or hateful toward those who surround the boy.
Dio from Last Exile seems like this at first — especially since he works for the Guild (the main antagonists who are all extremely pale and have either white or blond hair) — but is soon revealed to be hyper, enthusiastic, and prone to glomping. Oh, and he's terrified of his sister Delphine, who is a female example of this trope and later has him brainwashed into a soulless killing machine, thus making him fit this trope for a while. By the time Fam The Silver Wing starts he is back to being a subversion since he is his childish, energetic self again.
Innouva, Zagato's Dragon from the anime, is a white-haired Man in White who is cold and ruthless, even though he has genuine personal loyalty to his boss. He's even darker in the Sega game, where he's directly responsible for Lafarga's brainwashing and enforces You Have Failed Me on Zagato's other servants.
Majin Tantei Nougami Neuro has X, who arguably fits the trope, despite the fact that he can change shape. 'His' default form is a young, white-haired Bishōnen. This is his true form in the anime, although in the manga he was born female.
Vaith was an un-villainous example, until he dyed it black. He dyes his hair black as a tribute to his dead men after a battle. As he tells Mel, "The blood never seemed to wash off..."
Ardi is an archetypal example; he has red eyes to go along with his white hair and he's a villain.
Eugene Chaud/Ijuin Enzan from Megaman NT Warrior / Rockman.EXE. He becomes less of an antagonist as the series goes on.
Aizawa Kouichi in Nabari No Ou. While he's not an antagonist (so far) and is usually a laid-back, helpful guy, he's also a ruthless killer, can be very assertive, and knows suspiciously much about what's going on. Oh, and he's an immortal hybrid of snowy owl and human, which would explain the hair.
Interestingly, Kakashi admits he could have been this if he had chosen a slightly different path. The only thing that stopped him was Obito's sharingan, which was the last thing to instill a sense of hope in him after losing both his family and closest friends in the span of a few years.
Rebuild of Evangelion reconstructs Kaworu as even nicer, starting by stopping an Impact triggered by Shinji in the end of 2.0. By 3.0, he's defined as purely heroic, if extremely naive, angel-guy who wants to save humanity from extinction, go against his wicked keepers of SEELE and push his beloved Shinji to the path of heroism and happiness as the savior of the lilin. The movies and the seiyuu portray him as being aware of his past "lives" vaguely defined as of what that involves. He dies tragically, because Shinji betrays his trust and stops listening to him in a crucial moment. Interestingly enough, Shinji and Kaworu seem able to do the same: trigger Impacts.
Tsukishiro in Nightmare Inspector, a Baku who makes people's nightmares worse in order to make them tastier.
Sasame in Prétear. In the manga, he's blond and a supportive (if flirty) older-brother type. In the anime, he's silver-haired and betrays his friends for the Princess of Disaster, gets an Evil Costume Switch, and tries to kill Hayate.
Because white hair is apparently a genetic trait in the Shi clan, the royal family in Saiunkoku Monogatari, it is very likely that a few, if not most, or even all, of Ryuuki and Seien/Seiran's older family members were this, though those two certainly are not. Considering that they all killed each other off in a civil war for the throne and were fond of abusing Ryuuki when he was a child...
Hyou Riou also fits the trope, although the younger Riou does not.
Ralph of Soukou no Strain actually seemed to have gotten a bleach job, specifically for the purpose of being evil. In flashbacks to when he was sane, his hair was blond, shorter, and more professional-looking.
Buguese from Spider Riders. Initially a villain, but becomes more of an anti-hero once his motives are revealed.
Canute from Vinland Saga starts out as a subversion: he's meek, timid, and his favourite hobbies are cooking and reading the bible. After going through some pretty screwed up shit, his meek persona starts to crumble, until he transforms into a bit of a Badass.
Prince Bokar of Sennec from Voltron appeared to be nice at first, saving Princess Allura, but only later does his true self show as a Robeast that attacks the Voltron Force and kidnaps Princess Allura for Zarkon. Also, Prince Lotor, with a white mane that goes past his waist and a Villainous Crush on the Princess.
Numerous characters from Yu-Gi-Oh!; Bakura, Pegasus, and Marik, just to start. Even cards get this treatment; the Dark Magician owned by minor antagonist Pandora (Arcana in the dub) in Season 2 has white hair.
Actually, Bakura is a subversion: Bakura himself is actually a kind, soft-spoken, good-natured kid who genuinely wants the best for his friends. The real example of this trope is the Spirit of the Ring, who routinely takes control of his body and terrorizes the protagonists.
Argent from Apothecarius Argentum is a heroic yet tragic case, as his white hair is a result of his Acquired Poison Immunity. Though he is an apothecary and healer, he was fed poisons from birth to make him into an assassin. As a result, he himself is highly toxic.
Luca of Saint Beast combines the long, white anime hair with red eyes and possesses Elemental Powers of darkness, but is a pretty good guy (outside of Seijuu Kourin Hen), following the stoiclancer version of this trope. He does mention being afraid of his own capacity for darkness at least once, though, and if you count Seijuu Kourin Hen, he does eventually become an evil sidekick to Judas.
Ryo from 7 Seeds, who’s shown with white or silver hair on the covers. He’s calm and collected in personality, extremely competent, and turns out to be quite protective of the people he cares about. Unfortunately, he's ultimately willing to "protect" his friend Ango by trying to kill the people Ango is in personal conflict with- both to remove a threat to Ango's precarious mental stability, and also to prevent Ango from trying to kill them himself and being found out by the rest of their group.
Bleach: Gin Ichimaru, Aizen's subordinate. No-one trusts him, not the good guys and not the bad guys. Turns out he's as much an enemy of Aizen as the good guys are, but that doesn't change his villainous nature.
Bleach averts it with Ukitake Jushiro and Hitsugaya Toshiro.
Killua Zoldyck of Hunter × Hunter. Initially. His father and grandfather Silva and Zeno Zoldyck also fit the bill.
Subverted by Daniel Thace Peregrine AKA Cupid from Angel Crush; his silver hair and abrasive behavior suggests this trope, but he is an angel and sides with Good.
Russia and Belarus of Hetalia fit the anime stereotype of Russians having platinum hair and pale skin, and they're not exactlyevil but they're definitely Ax-Crazy. Russia is a Psychopathic Manchild with his mind twisted by a history of bloodshed, has violent mood swings, has a sick sense of humour and is super possessive of everybody he considers his "friend", and his sister Belarus is a harsh Knife Nut who's every bit as cruel and is a batshit creepy stalker of him. Prussia makes use of this trope as well as Evil Albino; he was designed with a villainous image in mind, and he can occasionally be a jerk who screws things up For the Evulz, but he's not one bit aloof and mostly shown to be an annoying and egocentric but good and loveable person. Then again, he is also one of the few nations with the honour of being shown about to kill another onscreen (and not Played for Laughs). Averted with Finland, who is one of the kindest characters, and Iceland, who is more or less a typical awkward teenager and fits Mystical White Hair instead.
Heylel (Hebrew name of Lucifer/Satan) in Manga Genesis has white/silver hair, even later in the manga when he is shown with horns, devilish wings, and dark clothing he still has the white hair, and bishounen face.
White hair is strangely common among the employees of MBI in Sekirei. Diabolical Mastermind Hiroto Minaka, Nietzsche Wannabe Natsuo Ichinomi, and Big Bad Karasuba all fit it. However, Takami Sahashi and Takehito Asama both subvert this — while active in the company's experiments and not above using people, both are ultimately good at heart.
The entirety of the Fuma ninja clan in Donten ni Warau fits the bill. Most prominent among them and most involved in the story is Fuma Kotaro. Both of them. There's even an interesting observation to be made about perceived level of evilness depending on whether the hair's down or bound back.
Tokyo Ghoul plays with this, having several characters with white hair.
Arima and Tatara play it straight, both serving as ruthless agents in their respective organizations. Both are described by the author as "sadistic".
Subverted: Renji Yomo is an intimidating figure when first introduced, but turns out to be a kind and supportive mentor to Kaneki. While violent and temperamental in his youth, even then he was more troubled than malicious.
Downplayed with Ken Kaneki, our unfortunate protagonist. The ordeal that turned his black hair white left him a far more ruthless individual, as well as mentally unbalanced. Similarly, Kureo Mado initially seems to be nothing more than a sadistic monster until we begin learning about him after his death. While brutal and merciless towards Ghouls, he was a devoted family man and supportive mentor remembered fondly by his daughter and former partners.
X-Men's got Magneto and Quicksilver, though some artists draw Magneto to look like it's old age. He was first introduced in 1963, less than twenty years after the Holocaust ended. To maintain his backstory as a survivor of Auschwitz, some aging is inevitable. However, he's not actually supposed to look his age - Between Marvel's sliding timescale and the fact that he was reduced to infancy at one point and later re-aged to his prime, Magneto should really look more like Quicksilver's (slightly) older brother than his father.
During the Trial of Magneto, we see a flashback of Magneto during his "regressed to infancy" phase. He has white hair.
Tommy Shepherd, aka Speed of the Young Avengers, mostly as a callback to the fact that he's the reincarnation of one of Scarlet Witch's kids-who-were-part-of-Mephisto/never-existed-except-for-her-wishing-them-to. In an existential screwup that could only happen in comics, he and "twin" Billy Kaplan are mirrors of their former mother and uncle, with him having Quicksilver's powers and looks.
Josh from Trigger Happy Fanboy's Pokemon trilogy is one. He didn't start out as a villain, though, and actually aided the protagonists for a while before going his own separate way. While on the light side, he was definitely aloof but my no means antisocial. He even sported a bit of a Ship Tease with May until the end of the second part, in which a two year timeskip takes place. When he returns, he's revealed to have gone down a Sanity Slippage and gone drunk with power. He's also nigh unbeatable and now sports red eyes. And a Badass Longcoat.
Cade in Sky Blue strenuously resists Shua's attempt to bring down Ecoban to help the Diggers, and tries to keep Jay away from him. It's later revealed that he was originally responsible for Shua's exile. He does get redeemed eventually.
Films — Live-Action
Silas in The Da Vinci Code, played by Paul Bettany (who seems to be making this trope a big part of his repertoire, and doing it well).
Hellboy II's Prince Nuada. Sure, white hair and skin runs in his family, but he's still the villain.
Rimmell, Duke Jared McLain's architect in Deryni Checkmate, has his hair turn white overnight when he was a boy, and his family and neighbours blamed a local Deryni woman for it. He falls madly in love with his boss' prospective daughter-in-law, Duke Alaric Morgan's sister Bronwyn, and he goes so far as to obtain magic to woo her despite the difference in their social stations and the fact that she's in love with someone else (her finacé Kevin McLain Earl of Kierney). This does not end well.
Judhael Quinnell, Prince-Bishop of Meara, is said to be in his thirties, yet his hair is prematurely white. He goes along with the plans of his aunt, the Mearan Pretender Caitrin Quinnell, and former Archbishop Loris to further his own ambition to become a bishop. He gets what he wants, but he stands by and allows Loris and Caitrin to condemn the loyal Bishop Henry Istelyn to a grisly death for his loyalty to King Kelson Haldane. He later repents of his ambition and refuses Kelson's offer of clemency to prevent further rounds of Mearan separatist rebellion, going willingly to his own execution at the end of The King's Justice.
Raistlin Majere of the Dragonlance books: pretty (the prequel novels mention he was more handsome than his brother as a young man, though YMMV post-transfiguration), cold and antisocial, and an Anti-Hero at his best moments.
White Mike, the drug-dealing antihero in the book Twelve.
Ariel from The Obernewtyn Chronicles book series by Isobelle Carmody is a classic example, being described as angelic in looks and satanic in temperament.
Modern Tales of Faerie has Roiben, a gorgeous faerie who is damaged and bitter after being forced to serve as errand boy for the Unseelie Queen and perform horrific acts for her amusement. He falls into antihero territory, however, since those acts were magically compelled and he remains good at heart.
Mordred in T.H. White's The Once and Future King, "so fair haired that he was almost an albino." He is, at first, merely self-pitying and creepy in the give-the-poor-kid-a-break way, but ultimately turns evil.
Sort of subverted in The Grey King, in Susan Cooper's The Dark Is Rising series of books, where Bran Davies's odd white hair is used to give him a quality of otherness, even though he doesn't turn out to be bad.
The whole trend (at least in Western literature) can be traced more or less directly to Elric of Melniboné as written by Michael Moorcock. Elric is a weakling albino, often described in terms of effeminate beauty, who comes from an ancient line of powerful, cruel, Chaos-allied people. He is granted superhuman prowess in combat by a cursed sentient sword which eats the souls of opponents, and he tends (often through the interference of said sword) to kill his allies and/or lovers with alarming regularity.
R.L. Stine evokes this with the character Bill Jeffers, a.k.a. Snowman, in the book of the same name. Bill is described as being tall and white haired with black eyes, and is extremely attractive to most women he meets. He's also a murderer who doesn't have much regret for what he did. His father, however, DID bring it onto himself by beating his son and physically abusing him until the kid snapped. Whether he's evil or not depends greatly on who you ask in the fandom and how much sympathy you have for abuse victims.
Although definitely NOT EVIL, Tonda in Otfried Preussler's novel Krabat has had white hair since half a year before the book starts, as his girlfriend Worschula was killed by the Master then. The grief turned his hair white, so it's rather White=Death than White=Evil.
In the movie, his hair is not white from the beginning, as Worschula dies when Krabat already is in the mill, not 6 months ago, as the book states...
He's not that good-looking in the movie, but as it takes place in Thirty Years' War...
Toot-toot the fairy of The Dresden Files is white-haired and described as just as inhumanly attractive as all other fae folk. He is, however, a fairy, and his height is between six and twelve inches. While not evil, per se, he is Chaotic Neutral with a very mercenary conscience, who serves the heroes for regular payments of pizza.
The Ghost of Christmas Past in A Christmas Carol, although it is of Ambiguous Gender in the book. In certain film and theatre adaptations, it is portrayed as a girl/woman.
Martel in The Elenium posesses natural white hair, and is described as having a surprisingly youthful face. He's also a fallen knight.
The Hawkbrother mages in Valdemar fall into this trope—most notably Firesong, though they subvert it by being generally honest and decent people; they tend to have white hair because the magical forces they call upon bleach the color out.
In Agatha Christie's Curtain, Stephen Norton counts as this, since he is not only a bird-watcher with a quiet disposition, but he is also a Manipulative Bastard who commits murders-by-proxy, though his hair is grayish-silver.
The main enemy race from Stargate Atlantis, the Wraith, have long white hair as one of their most characteristic characteristics.
The live-action Pretty Guardian Sailor Moon series gave Zoisite white hair. Though, while he is still one of the four generals of the Dark Kingdom, he is also the one to remember his past life and his loyality to Endymion, and the past tragedy; he even goes so far as to briefly team up with Minako to try and keep Usagi and Mamoru separated.
Datak Tarr from Defiance, he is a Castithan a race of white hair and white skinned humanoids, and Datak is one nasty snake in the grass, he is willing to use any means to achieve his goal, and killing people is an acceptable option.
In Twin Peaks, one of the more obvious signs that Leland Palmer is possessed is that his hair turns white overnight. The demon possessing him has grey hair.
Dark Eldar Mandrakes are typically painted as shadowy figures with stark white hair. Even other Dark Eldar are a little weirded out by them.
The Drow in Dungeons & Dragons games are a race of sly, scheming, Always Chaotic Evil White-Haired, red-eyed (albeit Black Skinned) Pretty Boys and Girls. The males in particular tend to be underhanded, effeminate blackguards. One issue of the late Dragon Magazine gave us the drow demideity Keptolo.
Herbert von Krolock of Tanz Der Vampire fits this trope to a T. Even when he's played more on the goofy and lovestruck end of the scale, he's still a literally bloodthirsty vampire.
Arthas from the Warcraft III and World of Warcraft. In Warcraft III, he was initially blond, at which point he was morally clueless, and also pretty clueless in general, but largely seemed to mean well. His hair immediately and abruptly went white shortly after he took up Frostmourne and became a Death Knight, which is also the exact moment at which he progressed from "well-meaning extremist" status to being clearly and unambiguously capital-E Evil.
If he's not grinning like an absolute loonball (as in the Wrath of the Lich King opening cinematic's final scene), he's pretty attractive, if he IS grinning like an absolute loonball (as on the Frozen Throne expansion pack's box cover), HE REALLY ISN'T.
It's actively said in Warcraft III that Arthas doesn't have a soul. Maybe because Frostmourne ate it, so the white hair may have something to do with that.
Arthas: Yes, I've damned everyone and everything I've ever loved in his name, and I still feel no remorse. No shame. No pity. Tichondrius: The runeblade that you carry was forged by the Lich King and empowered to steal souls. Yours was the first one it claimed. Arthas: Then I'll make do without one. What is the Lich King's will?
Setzer, of Final Fantasy VI is a rebellious, elitist, whitehaired gambler who kidnaps Celes, but inevitably joins the party.
Yazoo, Loz, and most notably Kadaj from the sequel film Final Fantasy VII: Advent Children, who are brothers from the same "mother" as Sephiroth. Official materials even name them collectively as "The Silver-Haired Men".
From the Kingdom Hearts series, we have Xehanort, Ansem, and Xemnas. Notably, they avert the corrolary of "being Ambiguously Brown negates the evil of white hair". Interestingly enough, Birth by Sleep shows that the body that Xehanort is inhabiting used to have brown hair. His absolute youngest incarnation is still an example.
Wilhelm in Xenosaga is an example of this trope, and chaos (no capitalization) is an example of how dark skinned white haired guys are exempt. Albedo is another example from the same game.
Magaki, endboss of XI, also fits the trope when he first appears to the player, but he subverts it, as his true form is a lanky, bug-eyed, pink...thing who shambles about, and his body is racked with muscle spasms. Not actually pretty at all. He still keeps the white hair, though.
Ayatane in Ar tonelico, whose evil status is complicated, but does definitely spend at least a portion of the plot being on the opposing side.
Hyo Imawano from Rival Schools, who goes from main villain, to willing ally, to possessed villain, to dead, all in the span of two games.
Wild Arms 2 includes a white-haired bishonen who, amazingly enough, isn't evil. He acts as Mission Control for the Heroes R Us organization that the Player Character is a part of. Oh wait, he's the boss of the villains too, and it turns out this a Xanatos Gambit to mobilize the world against a cosmic threat. A good goal, but he was ruthless in pursuing it.
Tales of Vesperia's Duke is a subversion. He's menacing as all hell, enormously powerful, and even the final boss, but he's not even a true villain; he just wants to protect the world from the dangers of Blastia.
Alexei is one too. In fact, if he grew his hair longer, you wouldn't be able to tell the difference.
Fou-Lu from Breath of Fire IV. Cranked up to 11 in the manga, and overtly embraced when Ryu confronts Fou-lu in the throneroom for the first time. Not since Hotohori in Fushigi Yuugi has any man looked that pretty in formal imperial court dress. And yes, the more Fou-lu gets overtly shoved to being a Woobie, Destroyer of Worlds, the prettier he gets.
Joshua from The World Ends with You is not only pretty and has white hair, but he's also the one who almost UNDOES Neku's Character Development from week one with his prissy and mysterious behaviour, and finally turns out to be Neku's killer (twice), the Composer, and the one who wanted to destroy Shibuya in the first place. However, he ends up showing "mercy." All this while spouting cryptic "deep" sayings, and being mysterious and ostensibly metrosexual (he teases and hits on Neku often, and good number of the items that give him special abilities are womanly in nature).
Suikoden V invokes this trope for a woman. After her Face-Heel Turn, Lady Sialeeds stops dyeing her hair, revealing the fact that it was white all along just in time for you to fight her for the first time. Given that she doesn't pick up any of the connotations of the White Haired Pretty Girl, while picking up this trope's penchant for antagonism, she probably fits here more than there.
Karsh from Chrono Cross looks like one of these at first glance, being the first humanoid boss you fight (not counting Solt and Peppor, who fight alongside him), along with having the standard silver hair. However, he's not evil, just efficient at his job (and ashamed of having to kill his Brainwashed and Crazy best friend), and later, he joins the party.
Lloyd from The Legend of Dragoon. He spends most of the game being a huge thorn in the party's side, from beating the pants off of the protagonist in an arena fight to plotting to destroy the world, only to do a Heel-Face Turn at the last second, making way for the REAL Big Bad.
Then again, like the Drow example above, Lloyd belongs to a race of White-Haired Pretty People, who, given their history, are not exactly known for being the nicest folks around.
His expy from the second game has this look, but his Jerkass personality prevents many in universe from appreciating it. The Anguished One looks like this as well, to the point fans consider him an expy of Kaworu.
Gregorio III from Gitaroo Man, complete with heterochromia and creepy intro. Also considered to be That One Boss sometimes.
Fenris from Dragon Age II - his hair probably got that way he had magic tattoos made of lyrium burned into his skin. He's merciless to his enemies (who, to be fair, are trying to recapture him for the Evil Sorcerer who branded him in the first place), and his attitude towards mages varies from justified wariness to outright hostility. He mainly wants to be left in peace (and take out the occasional band of slavers).
Aizel from Opoona. In his case, he has a bad case of the possessed by the spirit of evil. His brother, Shalga, has it as well, but he's only a Hero with Bad Publicity.
The Legend of Zelda: Skyward Sword gives us Ghirahim, an androgynous, sadistic entity that torments Link throughout the game, switching between calm and collected and bombastically violent outbursts very rapidly. His androgynous nature is a produce of his creation, as like Fi he is a technically genderless Anthropomorphic Personification of Demise's sword.
L.B. Gofer fits the mold as a humanoid Bacterian with silver hair and is primarily the petty, childish, and cruel sort of evil. In the same series, there's Dark Force; though her hair is more white than silver, she is no less evil than the Gofer sisters.
Schezo Wegey from Puyo Puyo initially plays it straight in his debut game, Madou Monogatari II. He's a dark wizard who wants to steal Arle's power for himself, even if it means killing her to get what he wants. After that, he subverts it, ascending to being a playable protagonist in the more recent installments.
Tsukumogami walks the razor edge of this trope - specifically, every character with SILVERY-white hair is evil, but characters with PURE-white hair are good. To the point where one normally white-haired character turns silver-haired when switching to his Superpowered Evil Side.
The eponymous main character in NieR Replicant is initially a sunny and optimistic teenager (though the short stories in Grimoire NieR reveal he is more of a Stepford Smiler), but after hitting the Despair Event Horizon at the end of the game's first half he becomes unhinged, psychotic and murderous, though his interactions with his True Companions reveal that there is still a good person underneath. This still applies to the father version of the character in NieR Gestalt post-timeskip though it's much more subtle compared to big-brother Nier who undergoes a much more radical change.
In Shin Megami Tensei III: Nocturne, one of the things that changes about Chiaki after she merges with Gozu-Tennoh is her hair, which changes to a piercing white color. This along with her Red Right Hand is proof that her Reason has taken her over the deep end and she's gone completely insane.
The titular Villain Protagonist from Legacy of Kain. While his ultimate goal is to bring the world back into balance, Kain is a world-conquering vampire who will go to any lengths to ensure that he'll be the one on top when he succeeds. Bonus points for actually having a "black heart", the Heart of Darkness, until it gets ripped out of his chest.
Taichi in Cross Channel is a somewhat androgynous white haired teen and the hero of the story. Unless he has one of his psychotic episodes and kills everyone. And snapping and killing everyone isn't just confined to bad ends, either. Nope, the journal logs reference them and one of the very last endings involves Taichi killing Youko to defend everyone in what is probably a very brutal manner, causing everyone to freak, and then he kills them. His hair is often commented upon. Oddly enough, he actually has something of a complex, where he is convinced that he is incredibly ugly.
Archer from Fate/stay night. His white hair and cynical Anti-Hero nature qualify him for this trope...as does his penchant for a redBadass Longcoat. Further, his actions and intent, in the Unlimited Blade Works arc, of killing the hero — his past self — to end the eternity of fighting and slaughter he lives out arguably grant him Anti-Villain status. Accounting for his cumulative actions/motives, he probably fits under the greater majority of the hero and villain tropes here.
Godot from Phoenix Wright: Ace Attorney has white hair, though it was originally black as Diego Armando, but it changed when he was poisoned. His true identity is unknown through most of the game, he remains the most obviously mysterious prosecutor in the series, prone to belligerent outbursts when upsets, and he plays a key role in manipulation the events of Bridge to Turnabout putting all the pieces in place for him to "save Maya.
Florent L'Belle from Dual Destinies is a straight example, although his having white hair isn't immediately obvious, and it turns out to be the decisive evidence against him when you find out that the white hair inside the Amazing Nine-Tails mask belongs to him.
The original Tohno SHIKI in Tsukihime has white, shoulder-length hair. He is also possessed by the Big Bad, inverted (meaning, given up completely to a Superpowered Evil Side), and completely insane.
Umineko: When They Cry has Kyrie Ushiromiya whose core defining trait is Envy, is confirmed to have been one of the true culprits behind the murders and showcases some signs of being a sociopath, especially in EP7.
There's also Juuza Amakusa, Ange's bodyguard. Despite being friendly and teasing towards Ange, EP6 reveals that he's also perfectly willing to kill her.
Not to mention Kinzo Ushiromiya, who is implied and later confirmed to have started a massacre to monopolize the Fascist Gold and is notorious for having been a tyrannical and abusive father.
Rose Guns Days, another work by 07th Expansion, features several of its own:
Alfred Akagi, a crazy mafia boss and first antagonist to Primavera.
Bell from PPGD has has white hair and is the daughter of the Big Bad. She appears constantly as a villain and fights Blossom several times.
Oric the Awesome, the Big Bad of Warrens Of Oric The Awesome has long white hair. He spends all his screentime beleaguering his assistant and gloating to the heroes. He also runs a shop. And overcharges.
Evil-Lynn (The Dragon to Skeletor in Masters of the Universe) rarely takes her helmet off, but the rare occasions she does in both versions of the series reveals her hair to be short and platinum blonde, clearly making her fit the Trope.
Vlad of Danny Phantom in his human form. His hair turned white when he first got his ghost powers and turned evil. Danny, on the other hand, is a subversion since his ghost form has white hair. Also played straight with Dark Danny.