A Fallen Angel who rebels against the creator's will, and may or may not want to supplant them. If there are no beings outright called angels in the setting, then said character could be a member of another group of beings who are either divine, otherworldly, or just have abilities that others don't.
Chances are, if a work is using Everybody Hates Hades, then Hades as well as another being or creature associated with death will be depiced as an Satanic Archetype.
Sub-trope of Hijacked by Jesus of the setting isn't explicitly based on Christian and Western mythology. Compare The Anti-God. Will frequently overlap with the Louis Cypher, often in the way of emulating the term "Old Scratch", or some form of his own name. The counterpart trope is Messianic Archetype. Also see Big Red Devil, for a character who only looks satanic but doesn't demonstrate satanic behavior.
Berserk The Idea of Evil is the Ultimate Evil in the series it commands the Godhand and all Apostles and in addition to its gastly appearance the only thing separating it from Satan himself is that it hasn't betrayed anyone it does deals with and the people who deal with it sometimes gleefully accept knowing full well what will happen, and the worst part is that it isn't a fallen angel rebelling against some creator God it is God.
Dabura is heavily based on Satan, being the ruler of a demon world and otherwise looking demonic. However, he was enslaved by an evil wizard. Dabura appears in Sand Land as Lucifer.
Piccolo was also placed in the role of Satan for a while after his introduction. Specifically, the first Piccolo went by the title of "Daimaou" or "Demon Emperor". The better-known second Piccolo, the reincarnation of the original, also initially considered himself the Daimaou, but was never actually as evil as he'd been in his first life and eventually made a full Heel-Face Turn.
Broly refers to himself as such; he may be the Saiyan equivalent as he is a berserker instead of a Proud Warrior Race Guy.
Ironically, Earth's "strongest" man is called Mr. Satan, but, global deception aside, the man's nothing like his namesake (even the mass deception is in part for the good of the world). He's as gentle as a flower, tried to befriend Majin Buu, and rescued a puppy from gun-toting thieves.
Mr. Satan was merely his character title when he was a wrestler, which is strange because Satan is his last name (his first name, funnily, is Mark of all things).
The Digimon franchise likes the theming species of mons after Satan.
Lucemon, the Big Bad of Digimon Frontier, may be the example which plays as the straightest analogue to the most common Western interpretation of Satan, being specifically named for Lucifer. He even starts off as a benevolent ruler before being completely corrupted by his significant power, before being banished to the core of the Digital World, and undergoes several instances of One-Winged Angel in his (successful) quest to destroy the entire Digital World, ending up as Lucemon "Satan" Mode. He reappears in Digimon Xros Wars as a minor villain.
SkullSatamon, one of the minions of the generic demon lord Daemon.
Ronin Warriors presented a ha'sa'tan/Satan equivalent in the form of Arago (Talpa in the American dub), absolute Emperor of the demonic nether-realms, and, in general, literal Adversary of all mortals.
Lanancuras, the ultimate villain of Shinzo, was a member of the cosmic race of Celestial Guardians and given the duty to protect the Milky Way Galaxy. He was eventually corrupted by his power and turned into a Satanic figure, so the other Guardians responded by sealing him inside a meteorite to protect the mortal beings from him. The lingering influence of his evil on the world caused the Human-Enterran War and he isn't released until the second season. Mushra eventually transforms back into his angelic celestial form to defeat him.
Puella Magi Madoka Magica The Movie: Rebellion ends with the creation of a devil to oppose Madoka's god. The worst part? It's her best friend and the movie's protagonist, Homura. Despite having much in common with Lucifer from Paradise Lost, Homura acts more like a Buddhist demon; she takes the part of Madoka that was human, usurps her power, and recreates the world so that Madoka lives a normal and happy life while remaining ignorant of her true nature. It gets REALLY complicated since due to Shrug of God, she's Ambiguously Evil. Not to mention that there's plenty of evidence for her sincerely caring about the other girls, leading to the Zero Approval Gambit theory being relatively popular.
In the Marvel Comics, the Hell Lords is a group of demons composed of Asmodeus, Hela, Mephisto, Pluto, Satannish The Supreme, and Satana. Former members of the group included Beelzeboul, Dormammu, Hellstrom, Lucifer/Satan, Marduk Kurios, Olivier, Thog the Nether-Spawn, and Umar the Unrelenting. Yes. Satan himself used to be a member of a group of demons who represent all the aspects of Satan. Somehow. Many have admitted to either inspiring, playing off the name, or claiming to be the REAL Satan. Thanks to inconsistent continuity and their own history as liars nothing they say can be believed. This was further complicated with the introduction of the real Lucifer- Who is very specifically the Satan of the Christian religion in the Marvel universe. A tie-in to the Fear Itself crossover introduced Satan's empty throne, but was unclear if there was a real Satan and if so who it was(Though when we saw God's throne in Ghost Rider: Heaven's on Fire, it was also empty). Only to have several hell-lords claim to be Satan, but none sit in it for fear of being torn apart by the other hell-lords.
An excellent version of the "Casting a character in a polytheist story as the Christian Satan" subtrope occurred in the comic Rogan Ghosh, Star of the East, in which the setting and characters were Hindu. Hanuman appeared as The Obi-Wan and the Non-Human Sidekick, with hints of Small Annoying Creature all rolled into one. Kali appeared as The Dragon, and Ganesha turned up in the background for no reason, but the Big Bad was a character called The Soma Swami, False God of a Thousand False Worlds. In the story, he tempts people to sin or leads them into ignorance so that they'll stay in the wheel of reincarnation where he can feed on their energies. People who reach enlightenment/heaven/Nirvana have escaped him (as he himself puts it, "Fuck Christ! Fuck Buddha! They're just the ones that got away!") As a way of adapting the Christian devil to a Hindu setting, it's hard to imagine Soma being bettered.
The 'Pony POV Series has two beings who share this role. One is Discord's father, Havoc, the Anthropomorphic Personification of Mass Hysteria and one of the four Elders (the Top Gods). He's the Dimension Lord of Pony Hell, where the condemned are doomed to pull his chariot across an endless desert for all eternity. The other is Morning Star, a Fallen Alicorn who was originally supposed to be the Concept of Perfection and Beauty, but, like Old Scratch, became the embodiment of Evil and Temptation when he attempted to overthrow the Elders, seeing himself more perfect than they are. He was sealed away, but later released by Havoc to fight on his side of a war, and served as Discord'sEvil Mentor. What became of him after that is presently unknown (though Word of God is that he was either killed during the war or imprisoned in Hell under Havoc's watch as part of the peace treaty between the Alicorns and Draconequi).
Believe it or not, both Ho-oh and Uxie of Poké Wars fit this trope.
Ho-oh is a great and noble angelic being of light who's Pride makes him rebel against God's chosen plan in favor of his own vision and he makes other Legendaries/Angels join him by preying on their hidden desires and his fall to evil causes him to lose sight of what he originally fought for turning him into an angry, spiteful, and petty creature of darkness, that gets trapped inside the Pokemon version of Hell, the Reverse World.
Uxie is a monster that is sealed away and is released during an apocalyptic scenario who then proceeds to manipulate events from behind the scenes to his benefit, he is a creature that looks like a creature of good and light disguising his evil intent, he believes that he can make the universe superior to God's attempt, and he plans on making mockeries/clones of His creations to act as his army.
Films — Animated
Chernabog in Fantasia is portrayed as a giant black demon with horns and bat wings. Walt Disney even described him as being Satan himself. The god was based on a lesser-known Slavic god, which may be an example of Everybody Hates Hades.
Hades, the ancient Greek lord of the underworld, as depicted in Hercules. He acts a lot more like a cartoon Satan than how he's depicted in the old myths. His brother Zeus is essentially the Grandpa God, as Hades' scheme is to rebel against him and take over Mount Olympus, i.e. Heaven.
Films — Live-Action
Palpatine, the Big Bad of Star Wars, has many Satanic traits, and Word of God confirms Old Scratch to be the primary inspiration for the character (along with Richard Nixon). He's a Consummate Liar and Wicked CulturedMan of Wealth and Taste who deceives numerous genuinely good people into following him in a scheme that ultimately ends with him gaining control of the government to usher in (what he claims will be) a utopia (admittedly, this last part is more The Antichrist's area of expertise, but we all know who that guy reports to). In addition, the order he gives to wipe out all with the power to oppose him? Order 66. And that's just the stuff from the movies; the occasional Expanded Universe source has even gone so far as to imply that he's literally Made of Evil. Ian McDiarmid, the actor who plays Palpatine, at one point suggested that Palpatine is actually more evil than the devil. He points out: "At least Satan fell; he has a history, and it's one of revenge."
In Sunshine, Pinbacker serves as an adversary to humanity on God's behalf (in his own insane mind, at least), bringing to mind Satan's role as the Adversary in the Hebrew Bible. When Capa meets Pinbacker face-to-face, he's bathed in light, evoking Lucifer as an angel of light.
In J.R.R. Tolkien's The Silmarillion, Morgoth was the greatest of the Ainur (angels), but rebelled against Eru Ilúvatar (God). He corrupted Fëanor, he twisted Eru's creations into the various monstrous Slave Races, and created the Hell-like fortresses of Utumno and Angband which are occasionally called "Hell" straight up. When he was eventually exiled to the Void, his servant Sauron took his place as the Big Bad. Sauron continued Morgoth's Satanic behavior, corrupting the Númenóreans and ruling the Hell-like Mordor. Both Morgoth and Sauron originally had beautiful forms, but lost access to that ability. If Melkor/Morgoth was any more obviously the devil of Middle-Earth, he'd have an elven Louis Cypher name.
The Dark One in the Wheel of Time is, canonically, the Biblical Satan, claiming the true name of Shai'tan (the conceit of the setting being that Legend Fades to Myth and truths become muddled in mythology). The usual comforting mantra is that he was imprisoned by the Creator at the beginning of time. Where he came from isn't clear, but he remained safely sealed in his Can until the Aes Sedai in the Age of Legends accidentally cracked his prison. He offered them a Power that both men and women could use together (unlike their own magic), and several made deals with him. Too bad he wants to destroy the universe and end time. From inside his Can, he tries to destroy humanity using hoards of subhuman monsters, not to mention said quisling Aes Sedai.
In the Chalion series, the Bastard is sort of the Satan equivalent, being the offspring of the Mother and a powerful demon lord that did a Heel-Face Turn. He's the ruler of demons and god of the unexpected, including disasters; but his job is to rein in demons so they don't harm humans and he's also the god of unexpected blessings. He has a very vulgar sense of humor and is a Trickster Mentor to his followers but is basically benevolent; although he's also the one that meets out vengeance upon Karma Houdinis.
In the Narnia series, both the White Witch at the beginning of the series and the Calormene deity Tash are represented as evil opposites of Aslan, who is basically Lion!Jesus. Tash is also sort of a Crystal Dragon Allah... combined with Satan.
The Lone Power from the Young Wizards series. When the Powers That Be got together to create the universe, the Lone Power's contribution was Entropy and Death, for which It was exiled from the Powers' home dimension. The job of the titular wizards is to slow down the death of the Universe and prevent the Lone Power from further interfering with Life. It does get redeemed in one volume, but warns the protagonists that this only applies to the current "facet" of Its intertemporal existence — they will still have to deal with unredeemed versions of It.
In Fantendo canon, The Mysterious Mr. ? is portrayed as Satan, as well as the manifestation of Chaos in the universe. Mr. ? often comes to Earth and other universes and does not cause Chaos for the sake of causing it, but rather does it to maintain balance in the universes, as opposed to his counterpart Abaddon, the manifestation of Order. (Though he still does get some sick pleasure out of it.)
Nyarlathotep from Lovecraft's Cthulhu Mythos is more or less Satan, if not worse. A shape changer, sometimes humanoid (as the Black Pharaoh in 'Nyaralthotep'), sometimes a hideous Eldritch Abomination (as The Haunter of the Dark in the story of the same name); diabolical pact-maker (to Keziah Mason in The Dreams in the Witch House), trickster (to Randolph Carter in The Dream-Quest of Unknown Kadath). Although he does act as The Dragon for Azathoth, Nyarlathotep can be seen as a physical manifestation of the Outer Gods' will (Yog-Sothoth and Azathoth), and is referred to as their 'soul and messenger' more than once, which means the Outer Gods are colossal bastards. He's also the only one of them with a human mindset, and has active interest in humanity. This isn't a good thing. AT ALL.
Redwall features Cluny the Scourge. Sure, Asmodeus seems like an obvious choice, but all he has to seem demonic is his name and reaper complex.. Cluny, on the other paw, wears a horned helmet, a cloak made of bat wings, and an iron spike on his tail, making him look the part. He is a megalomaniac, a habitual liar, cruel to his underlings, and goes for a Deal with the Devil with a family of dormice. He even refers to himself as the direct opposite of what he calls the Redwall Abbey's guardian angel.
Many of the Gods of Darkness from Dragonlance have Satanic elements. Takhisis is the supreme evil deity determined to dominate the world, and her most iconic form is a multi-headed dragon. Chemosh is a tempter who tricks dead souls into remaining with the world, thereby damning them to become his undead minions. The closest Satan expy in terms of both methods and motifs, though, is probably Hiddukel, patron god of liars and crooked deals and tormentor of the souls of those who bargain with him.
Lord Foul the Despiser of the Chronicles of Thomas Covenant, immortal lord of evil and corrupter of mortal souls and a divine being exiled from heaven (though he's the Creator's evil doppelganger rather than a Fallen Angel, and he was exiled to the mortal world rather than Hell, albeit still associated with the Seven Hells by many characters). His name among the Giants, Santasheart Soulcrusher, makes this explicit (and his Dragon in the third book is called by the Giant name "Satansfist").
Buffy the Vampire Slayer: Glory shares a lot in common with you-know-whoï¿½a fallen god exiled to Earth, lives in a lavishly decorated apartment, wears expensive clothes, takes on the form of someone no one would suspect and is called "The Beast" despite her followers describing her as a "shining light".
In the episode "Devil's Due" from Star Trek: The Next Generation, an alien claims to be the Devil-figure from any number of worlds' mythologies (including Klingon) and "proves" it by taking their forms.
The original Battlestar Galactica, "War of the Gods": The fleet is tempted by the promises of the mysterious "Count Iblis" (an Islamic name for Satan), who turns out to be a fallen angel from Caprican mythology.
The two deitylike figures on the island of LOST, Jacob and the "Man in Black," both share numerous traits with the devil as a way of making it unclear who is good and who is evil:
Jacob has blonde hair, likes wine (and uses it as a metaphor for evil "corked" by the island), interferes with the lives of the characters in subtle ways, and is explicitly called "the devil" by the Man in Black, though he was presumably saying this metaphorically to exploitRichard's Catholic faith. He's also played by Mark Pellegrino — Lucifer in Supernatural.
The Man in Black is a shapeshifter and manipulator, known for taking the forms of the dead and deceiving mortals. He cannot kill Jacob himself and must use someone else to do it. He takes the form of a giant cloud of black smoke that sometimes looks like a slithering snake. He has been called "evil incarnate" and a personification of hell by various characters.
In Lexx, the planet Fire is a hot, barren world where people can only survive by living in cities built on top of tall pillars that hold them in the slightly-cooler higher altitudes. The planet is ruled by the Affably Evil Prince, and it turns out to be the afterlife for people who make bad decisions in life. Prince himself often claims ignorance of his origins and purpose, but understands that his job is to make sure the people of Fire suffer forever.
In Kyoryu Sentai Zyuranger, Witch Bandra's true master is named Dai (Great) Satan. He looks nothing like the usual depiction of the Judeo-Christian devil, being a floating blue head who yells a lot, and is mostly just an evil spirit that just happens to be named "Satan" (as opposed to being the "actual" Satan). When footage of Dai Satan was used for Mighty Morphin' Power Rangers, he was renamed "Lokar" and his role on the story was demoted to a monster who simply served Rita Repulsa.
666 Park Avenue: Gavin Doran is an evil supernatural entity. However, it remains to be seen if he is actually Satan, a demon serving Satan, or a servant even lower than a demon.
Gorog, the Big Bad in Wizards of Waverly Place is the leader of the Angels of Darkness. It's not clear if he is The Devil, or a high ranking minion of his, or simply an Expy. He does show some traits of the Biblical Satan, such as trying tempting the main characters into joining him. It also appears his minion base is made up from people he tempted and fallen angels.
In Hannibal, Hannibal Lecter serves as a Satanic figure vis-a-vis Will Graham's messianic archetype. Mads Mikkelsen plays Hannibal as if he were Lucifer, a destructive and inhuman being living among humanity. Hannibal tempts, manipulates, deceives, and destroys those around him. He appeals to the worst impulses in his targets (fear in Abigail, guilt in Jack, and ambition in Sutcliffe). He mimics God's power over life and death and arrogantly thinks he understands the Almighty, as suggested by his conversation with Will about how God enjoys killing, and his conversation with the "muralist" about reflecting God's light in his "mural". In several scenes, he's lit with bright light from behind, evoking Lucifer as an angel of light. Finally, in Will's dreams and hallucinations, Hannibal is symbolized by a monstrous horned man.
The Darkitect, as depicted in Dino Attack RPG. A Manipulative Bastard who actively plays with the emotions of his foes to tempt them into doing his bidding? Check. The Ultimate Evil of the universe? Check. Ruler of the Stromlings and Mutant Dinos, often referred to as "demons" by the inhabitants of Adventurers' Island? Check. The Darkitect may not be Satan himself, but he certainly fits the archetype.
Exalted has the Yozi, the so-called Demon Princes. They're Eldritch Abominations who built the universe and were overthrown by the gods and humans they had created (there's a strong titan theme with them). They now sit imprisoned in the Bloody Bowels of Hell, tormenting infinite hapless demons, trying to lure mortals and Exalted into Faustian deals for morally dubious goals. They aren't necessarily pure evil, but they're bad news very alien, and generally not fond of humanity. For example, the Ebon Dragon is the cosmic embodiment of betrayal, among other things. She Who Lives In Her Name wants to get rid of free will, for the greater good.
Horus from Warhammer40000, who was the favorite son of the Emperor, rebelled and tried to overthrow the Emperor in the early days of the Imperium. Further enforcing the analogy, when he rebelled, one-third of all Imperial forces followed suit.
Although for obvious reasons post-Gygax TSR and later Wizards of the Coast were extremely wary of allowing anything that could be even remotely used to put the charges of Satan-worship at their doorstep, there have been a few uses of Satan-like characters in Dungeons & Dragons:
Asmodeus, Beelzebub (under the alias "Baalzebul"), Pazuzu and other fixtures in Christian demonolgy are used as villains often in the various D&D worlds, particularly in 1st Edition and 3rd Edition (for most of 2nd, devils and demons were banned or renamed).
Satan himself was statted up in a fan-penned article in an early issue of The Dragon, long before the "D&D=Satanism" panic took off. As a injoke, Satan had exactly 333 hit points.
At this point, Asmodeus, the ruler of the Nine Hells, has become the single most direct Satan analogue in D&D, to the point of being Old Scratch in all but name.
Especially in 4th Edition D&D, where his backstory is now that he was once an archangel who led a successful rebellion against the god he served.
While not outright stated to be the devil, Diabolos from the Yu-Gi-Oh! card game seems clearly inspired by the devil. If his name (devil in Greek) and the title "King of the Abyss" did not tip you off already, there's also a LIGHT version of him, indicating he did at one point fall from grace or possibly the opposite.
The manga, on the other hand, has a much more straight example. See there for said example.
Eberron has a lot of hostile supernatural forces, but the oldest, most powerful, and arguably most purely malevolent are the Overlords of the Age of Demons, also known as the Rakshasa Rajahs. Each corresponds to a different form of corruption or destruction, and one of them, Bel Shalor, the Shadow in the Flame, is the most clearly Satanic. A tempter and deceiver who specializes in corrupting mortal souls, who likes to whisper from within the Silver Flame (which is the force that holds him imprisoned) and convince people to do evil in the Flame's name. Theologically, he pretty much is the Church of the Silver Flame's Devil, both for the above reasons and because their founder Tira Miron was first given divine power in order to defeat him.
Who else but Diablo, the Lord of Terror and the deadliest of the Prime Evils of Sanctuary?
Final Fantasy II: The Emperor Mateus Palamecia, after dying in battle against Firion and Co., goes to Hell, where he takes control of it as the Emperor of Hell and Pandemonium rises in place of Castle Palamecia. Even before all of that, Mateus had summoned demons from Hell which helped in attempt to conquer the world.
In Ashan, the setting for some of the Heroes of Might and Magic games, Urgash the Dragon God of Chaos and Kha-Beleth the Demon Sovereign share this role. Urgash meets the 'God of Evil' and 'rebelled against god' criteria; he warred against Asha, the Goddess of Order, during the Mythic Age when the world was relatively young, and was imprisoned in Sheogh, the setting's equivalent of Hell, after his defeat. Kha-Beleth, as the Supreme Ruler of Sheogh and leader of the demons that Urgash created to serve as his minions, meets the 'ruler of demons' and 'prominent antagonist' criteria.
Vigoor is the ruling devil and absolute authority of a "holy" empire of evil deities. Then it turns out via the second game that he's not the only "Supreme Archfiend".
Though the only other Supreme Archfiend is actually just the son of Vigoor. Or rather, the remains of his body after being defeated. So it's sorta the same being, but weaker.
Mundus from Devil May Cry, who was originally intended to be named Satan. He comes in white and looks somewhat like an angel (that is, until Dante messes him up but good, revealing the Eldritch Abomination within). He's not quite omnipotent, though, but it does seem thus far that he cannot be permanently killed, even with the power of Sparda, so Dante eventually has to seal him away like his father did long ago.
In God of War, Hades, the typical recipient, is ironically not this. However, Kratos fits it a lot better, especially in III. He is a favored champion of the gods who Turned Against Their Masters, leads the return of the Titans, essentially the same as the Legions of Hell to the setting at large at that point, and brings about the destruction of the world in his attempt to destroy the control of the Top God. Throughout that game and II, he is more or less seen as The Antichrist in-universe, without actually saying that he is.
The writers decided that plain old Satan was too boring, so the final boss and head of the demonic invasion triggered by Jitterbug is Demonic Imperator Tyrannosatan.
And the sequel has as its final boss a bizarre mash-up of demon and Santa Claus called... "Satan Claws".
Tekken has the Devil Gene, which allows most of the Mishima family (Besides Heihachi) to turn into a Devil, and the Devil Forms of Kazuya, Jin, and Jinpachi are usually considered the strongest combatants in the game as far as story goes.note This was passed over to them through at least one (Kazuya) Faustian deal with an evil wingedManipulative Bastard calledï¿½Devil.
Mortal Kombat has the Elder God Shinnok, who attempted to overthrow the other Elder Gods but was defeated and banished to the Netherrealm(which happens to be a fiery wasteland where evil beings hang around, blatantly Hell). At some point he overthrew the Netherrealm's ruler Lucifer with the aid of Quan-Chi, placing himself as the Netherrealm's ruler.
In the Pokémon franchise, Arceus is confirmed to be the creator- the god- of all Pokemon. Giratina comes closest to the role of Satan on a cosmic level: it's a literal god/Eldritch Abomination that was banished for its aggressive tendencies (in particular, its obsession with balance) by what is implied to be the aforementioned Arceus. While not evil (it prevents Cyrus from achieving An Arceus Am I), it's a fearsome opponent that has the potential of threatening the world whenever it believes that reality is in danger.
Rodin himself also counts all of the character art for Rodin in the unlockable extras never uses that name, giving his name as "Mephisto", the name of a German folklore demon most prominently mentioned in the Faust legend and occasionally has been used as another name for the Devil himself. Appropriately, Rodin's role is broadly similar to the traditional devil: a fallen angel who is thwarted and punished from trying to conquer Heaven (and is feared by it) who rules his own "sub-basement" location after his punishment, and jokes about the "deals" he provides Bayonetta.
In Graffiti Kingdom, the devil is a horned, purple guy-looking-thing named Medium. When freed from his imprisonment, he takes over Canvas Kingdom and plans to rule the world. His son Tablet overthrows him and becomes the new devil, so "devil" is probably just a title for "ruler of demons" rather than an actual entity.
Hazama/Terumi Yuuki from BlazBlue may also count as a Satan Expy. One of the revered Six Heroes, he betrayed his team and after being sealed, resurfaced once more to topple Heaven and God and shape the world as he sees fit: Make what he believed to be truth, which is DESPAIR, as the only truth in the world, and the lies of the world (which is everything) to be cut down. And he... succeeded in toppling 'God' (Takamagahara) by Continuum Shift, though only time will tell if the upcoming sequel will have him fall spectacularly. And not only he's Obviously Evil, he walks around with Eyes Always Shut, speak like a gentleman in order to lull his unaware 'allies' to move like he wills it, and if his acts with Litchi was to be believed, one of his modus operandi is driving people to sign on a Deal with the Devil, the devil in question is HIMSELF. And although his true name 'Terumi' is safe, the nickname 'Hazama' gives the meaning of 'otherworldly'... and all in all, very similar with how Lucifer meant 'Lightbringer' before he went on to be known as Satan or all those nasty other names.
Molag Bal in The Elder Scrolls series. Most of the Daedric Princes are Jerkass Gods who have Blue and Orange Morality when compared to mortals and display a mix of positive and negative qualities; Molag stands out as the Prince who has most consistently been portrayed as unquestionably evil and lacking redeeming traits. He claims domination and enslavement as his spheres of influence, and spends most of his time tempting mortals into wickedness so they will spread strife through the world in his name, then claiming their souls after death.
Sargeras was once a divine Titan tasked with battling the demon hordes and protecting the universe while the rest of the Titan pantheon created more planets. Exposure to the demons and their home dimension eventually drove Sargeras batshit insane, so he joined the demon hordes as their evil overlord. He led the Burning Crusade to invade many worlds and enslave/assimilate/demonize many species, before he was finally blown up on Azeroth. His blood and other leftover bits can give mortals great power, at the cost of sanity (and potentially turning into a demon).
The Eredar Kil'Jaeden also acts as a Satan analogue, being a Big Red Devil who introduced warlock magic to the orcs and aiding Gul'dan, as well as having Illidan attempt to dispose of the Lich King. He's even called the The Deceiver.
Deathwing the Destroyer is in some ways Crystal Dragon Satan. He was one of the five godlike Dragon Aspects made by the Titans to watch over the planet (or the son of an Aspect, Depending on the Writer). The Old Gods drove him insane, so he started attacking other dragons and ordinary mortals. He became a sort of evil overlord for an entire race of evil dragons and their minions.
Keisar Ephes from the Super Robot Wars Alpha subseries. He was once known as the Psychodriver Augustus that rules the Balmar world wisely, worshipped like a God, but felt left out in the cycle of life and death by Ide so sought to surpass him by amassing more power by turning the spirit of the dead into his power, becoming more sadistic and tyrannical along the way. His attacks involve summoning the spirits of the dead and giving apocalyptic visions while Laughing Mad, and if the victim is drained of HP from it, they get sucked to his Hell.
Super Paper Mario introduces the Mario version of Satan, a fellow named Bonechill. He was a Nimbi who fell from grace, and as punishment he was banished to the deepest level of the afterlife, to spend the rest of eternity among the other sinners. Like some depictions of the Devil (notably in the Divine Comedy), he is a draconic entity associated with ice. What really seals the deal is his six feathery seraphic wings.
In Legend of Legaia, the head Rogue is heavily implied to be the universe's equivalent of Satan. A thousand years prior to the events of the game, he led a rebellion against Tieg, was put down by Tieg's power, and banished to the Tower of Rogue for all eternity as punishment.
The Old-Timey version of the King of Town from Homestar Runner may actually be the website's equivalent of the Devil.
Doc Scratch from Homestuck. If the name wasn't enough of a clue. note "Old Scratch" is one name for the man himself.
The Tiger Barb from 95 Gallons is a Satan stand-in, working to corrupt the utopian fish tank by introducing currency, the concept of economics, the idea of people working for themselves rather than for the good of all, etc. He's also crafty, hiding his true evil intentions behind more blatant and short-lived acts of evil — the above are hidden behind the introduction of drugs, starting a feud between two families of gouramis over who has the nicest home, and tricking fish into worshipping an ultimately worthless game he fabricated, respectively.
Futurama has an in-universe example in the form of the Robot Devil, apparently created for the sole purpose of torturing sinner robots who transgress against the tenets of Robotology (which he's refered to as "our religion"). He's a tempter, a deal-maker, and a talented fiddle player (probably a Shout-Out to The Devil Went Down to Georgia above), but not too smart.
Bender: You may have to metaphorically make a deal with the devil. And by "devil," I mean Robot Devil. And by "metaphorically," I mean get your coat.
Al Roker from The Proud Family. He makes deals and has been proven to take his prices high. Like when Penny asks for all the parents to go away, he turns them all into Roker Ware slaves.
Unicron is, according to recent continuity, giant mechanicaltransformingplanet-eating Satan, although he comes a bit closer thematically to the Zoroastrian Angara Mainyu- a god of evil equal and opposite to the god of good, as opposed to Satan's "former servant" status.
In Transformers Prime Unicron is both God and The Devil like after being defeated by Primus Unicron is traped inside the earth like The Devil and Unicron became the parent of humanity and all life on Earth like God.
For a "former servant gone evil" Transformers also has one, named The Fallen, who comes halfway between this and Judas. He was one of the first 13 transformers God— er, Primus created, and went evil. And is on fire.
Trigon the Terrible, Big Bad of Teen Titans season four and father of Anti-Antichrist Raven, is very clearly a Satan Expy. In the original comic storyline Trigon was supposed to be Satan, no ifs ands or buts about it, but apparently the writers got concerned that the Moral Guardians would object. Apparently changing the name and adding an extra pair of eyes gets you off scott-free, though...
Winx Club's Lord Darkar is a pretty clear Satan-type figure, referred to as the antithesis to the Great Dragon (the source of all things good and light in the universe, as well as Bloom's powers). He's also responsible, in some way or another, for every villain featured in the first three seasons, as well as both movies.
Subverted in The Legend of Korra, with Vaatu. Although he is the spirit of chaos and darkness and would kill everyone if he had the chance, and has plotted the end of the world for eons, he is ultimately not depicted as the Bigger Bad, the only major influence of his being the corruption of other spirits, as well as the coming of the first Avatar. Ultimately, he more closely resembles the Zoroastrian evil god, Ahriman, than Satan, being on the same level as his "good" counterpart.
My Little Pony: Friendship Is Magic brings us Lord Tirek. According to the backstory he came to Equestria to conquer it and steal the magic of every pony (in this land, ponies are responsible for the cycles of the sun and moon and creating the weather, so he would control the forces of nature through this). This includes the alicorns, the closest thing to deities in this setting. Defeated and sealed in Tartarus, the show's equivalent of Hell, he broke free to become the villain of Season 4, picking up his plan where he left off originally. He also tricks Discord into making a deal with him for power, then screws him over on it, cementing the similarities. What really sells the comparison is his appearance◊ — he even has cloven hooves!
The High School AU movie My Little Pony Equestria Girls gives us Sunset Shimmer. She was once a student of Princess Celestia, again, the closest thing to a deity in this setting, but her pride and ambition leads to her being stripped of her position. Towards the end of the movie, she makes plans to send over brainwashed humans into Equestria to take it over. And furthering Satan parallels, when she puts on the Element of Magic crown, she transforms into a red-skinned demon (a form that has been dubbed Sunset Satan by fans).