Voiced by: Phil LaMarr, Jonathan Osser (Young, Jack in Egypt episode), Keith Ferguson (Punch Time Explosion)
Our hero, a samurai and the son of the samurai who initially released (and then defeated) Aku. He trained in every country in the world in preparation for the final battle... only to be hurled into the future before he could land the killing blow. Now he must Walk the Earth, seeking a way back to the past to finish that battle... not that this will stop him from setting things right in the future as well.
Berserk Button: Don't go hurting or manipulating the innocent in his presence.
Beware the Nice Ones: HOLY SHIT should you ever. He puts the lives of any innocent being he meets before his own, but getting on his bad side is a death sentence.
Blood-Splattered Warrior: Well, it's oil instead of blood, but Jack regardless blatantly and commonly gets the same concept applied to him in his battles with a color change to be PG.
Celibate Hero: He's got at least four valid motives for avoiding romance; it would distract him from his quest, he's a danger magnet, he'd have to return to the past, and he's been burned before. That doesn't stop the fangirls, though.
The Chosen One: Unbeknownst to him, he's going to be this when he's older.
Charles Atlas Superpower: All his physical feats are through training, right down to jumping to point where some mistake it for flight, picking up boulders, and surviving getting crushed by a building.
Hat Damage: Whenever he wears one, it's usually the first thing to go.
Honor Before Reason: Which makes sense, since honor pretty much defines what a samurai is all about.
Implausible Fencing Powers: Being able slice through anything comes from the sword's magic, but he also blocks gunfire on a routine basis, even at close range.
Katanas Are Just Better: Of course, the only reason being it was forged by the gods from his father's righteousness. It appears to be evenly matched with The Scotsman's sword, which was similarly mystically enchanted.
Nice Hat: Sometimes wears one made of straw. Episode 26 reveals that he knows how to hand-weave a hat from the husks of straw, which explains how he always manages to procure replacement hats when they get continually pulverized.
The pilot had him wearing a kabuto helmet made from scrap metal as part of a set of improvised armor.
One-Man Army: In the premier he takes down a whole army of killer robots by himself and wins, and in other episodes he routinely destroys multiple opponents at once.
Only Known by Their Nickname: Jack's real name is never mentioned in the series, not even by his parents! When Jack tells Ikra (who, as Aku, is almost the only being in the future that could know Jack's name) that he is called Jack, her expression is priceless. Of course, had she accidentally let slip his real name, she would have blown her cover right then and there.
The Quiet One: Usually speaks only a few lines each episode; some episodes he never speaks at all.
Strong as They Need to Be: He can consistently fight armies of enemies, but his limit varies depending on what the plot requires, along what his sword can cut through. It can hurt Aku, when almost nothing else can, and bring down giant robots, but it can almost never cut through the weapon his enemy uses.
Tyke Bomb: Non-evil example; Jack began training with numerous combat styles and many different warriors as a child, after he and his mother fled Aku's second attack on their homeland. Unlike most other examples, he was still brought up as a benevolent samurai with a code of ethics.
Flashbacks scattered thorough the series' run show that despite the rigorous training, Jack made many friends in the different countries he visited, played, and learned with the different people and cultures he met. Some people should take notes from this series on how to properly raise a One-Man Army.
The Wise Prince: He's actually a prince, and the day Aku appeared signaled the end of his sheltered childhood.
Voiced by: Mako, Greg Baldwin (Fusionfall), Fred Tatasciore (Punch Time Explosion)
Long ago - very long ago - a single small fragment of an Eldritch Abomination fell to Earth, wiping out the large saurian creatures that dominated the planet at that time. It existed as a mindless evil for millions of years until a brave king attempted to destroy it: the attempt to destroy it instead gave it consciousness. It became Aku, a being of pure darkness and evil. When the samurai who would later be called Jack came to fight him, Aku hurled him into the future as a last-ditch effort to survive. In the future, Aku rules the world, and devotes a lot of effort to finishing Jack once and for all.
Bad Boss: You're probably safer as one of his victims than one of his minions.
Badass: He is at strong and powerful demon who can swallow bullets.
Big Bad: One of Jack's main goals is to defeat Aku.
Big Brother Is Watching: He possess a screen that allows him to constantly watch Jack wherever he is. It was only interrupted when Jack entered a particularly holy place, which led to tv static.
But for Me, It Was Tuesday: Inverted, a group of aquatic aliens whose planet can't sustain them anymore due to their world's oceans disappearing come begging him for help, and they were not aware that that was his doing, but he does remember them.
Card-Carrying Villain: Often refers to himself by several evil-sounding titles, just in case you couldn't tell he was evil by looking at him.
Combat Tentacles: Whenever he's in octopus form (one of his favorites) or reverts to formlessness.
Complete Immortality: He hasn't aged at all since the day he was 'born' and heals from injuries almost instantly. The only weapon that causes him real harm and could potentially kill him is Jack's sword.
Immortality aside, the episode "Jack and the Gangsters" shows it is still possible to at least overpower him and keep him at bay. The episode revolves around a MacGuffin called the Jewel of Neptune, a powerful artifact that even Aku himself is unable to seize due to the powerful elemental spirits guarding it. His numerous attempts to steal it have resulted in him getting his ass handed to him (both by the jewel's creator in his first attempt and the elemental spirits in the later ones), and during the timeframe of the episode, he'd long since given up trying. Cue Jack infiltrating a group of Aku-friendly mobsters and obtaining the jewel so he can be granted the opportunity to meet Aku face-to-face.
Dark Is Evil: In addition to being mostly black, his primal form is nothing but a billowing dark mass.
Do Not Go Gentle: While his usual response to things not going his way is to run, if that's not an option, usually when confronts him in his castle, he won't go without a fight.
Evil Cannot Comprehend Good: A large reason that his attempt to throw Jack into the future backfired. He'd expected a world ruled by him would allow him to crush Jack effortlessly when he arrived. He never took into account that a hero arriving and successfully fighting back his forces would trigger Hope Springs Eternal and start giving the oppressed masses someone to rally behind. Also shows when he tries to make himself out as the good guy in the stories he tells to children in one episode, one of the prime reasons it doesn't work is he didn't really comprehend what being The Hero actually meant.
Eye Beams: Multiple types for multiple purposes; force blasts, incendiary force blasts, alchemy, summoning, teleportation, transformation, necromancy, and general spellcasting. Basically, whenever Aku's feeling lazy, he'll just use his eyes.
Faux Affably Evil: Aku is comedic and likable on the surface and is certainly capable of having nice, civil conversations with people, but he's a complete and utter monster who punts dogs like footballs. He would probably be the most disturbing villain in animation history if he wasn't so damn entertaining to watch.
For the Evulz: The only real explanation for his actions: Aku does what he does because the suffering of others amuses him, as demonstrated by his signature Evil Laugh.
Foil: He's very much the exact opposite of Jack. While Jack seeks to do good where ever possible, even at risk to his well being and goal of returning to the past, Aku always seeks out any action where he make life miserable for others.
Galactic Conqueror: Ruling the Earth wasn't enough, so he extended his conquest to other planets. It's not made clear how many planets he's conquered, only that it's attracted aliens of all sorts to the Earth. What has been shown of his conquests, is that he once reduced a planet unable to support its indigenous inhabitants for no apparent reason besides that he could.
Jerkass: Fairly obvious as he is a villain, though he tends to swing back and forth between a comedic villain and truly evil one. Notable acts of evil include in the pilot episode when some aliens that lived an aquatic world whose oceans were dried up come to him requesting to live on Earth and reveals that he dried up their planet, though he does let them stay on Earth provided they build statues every month. Another note is when he forces a scientist to build a set super robots to kill Jack under the promise of sparing his village if does, and then tests the robots out by having them burn his village to the ground and kill everything in it.
A great example of this is when he mocks Jack in the end of "Jack and the Warrior Woman". Just when Jack finds an artifact, which could have sent him back in time to defeat Aku, Aku destroys it and mocks Jack for trusting him.
Laughably Evil: He's rather... Goofy for being the Ultimate Evil and all. Varies depending on the episode, there are some that present him as legitimately evil and threatening figure. Or sometimes a bit of both.
Large Ham: So hammy that one of the first things he makes his slaves do is build statues of him.
Meaningful Name: The word "aku" means "evil" in Japanese. It's also worth noting that he's the only major character in the series who is known by his real name.
Morphic Resonance: He always has the same black, red and green color-scheme in every form he takes.
Narcissist: He once said "No mortal can defeat him." right before getting his ass handed to him, asked for a group of fish people to build statues of him every month, and sees Jack as foolish for even trying to fight him.
Nigh Invulnerable: Demonstrated when we see stuff outside of Jack attack him. It doesn't seem to matter if it's ancient weapons or advanced technology, mundane forms of attack can't hurt him.
Orcus on His Throne: Justified. The entire premise of the show started because Jack could defeat him, so Aku actively avoids facing him himself unless he's gained some advantage that he's sure will let him win. "Tales of X9" also revealed that the entire reason he relies on an army for conquests is because he found taking over the world on his own was going at too slow a pace for him.
Aku's last resort to send Jack into the future as Jack was about to off him. If Aku can open a portal in time in this situation, surely he was strong enough to do something a little more fatal than that. Sure, Jack's stuck in the future, but fact is that he is still alive.
Villains Out Shopping: Is sometimes seen just hanging around his base when not attacking Jack, particularly in comedic episodes.
Aku(on the phone): I think I'm in the computer... Oh! Yes, Extra thick. (Evil Laugh) Yes! Thirty minutes or it's free!
Voluntary Shapeshifting: He can transform into pretty much anything, usually an animal but he can also change his shape to the point where he's outright formless, and even introduces himself as a "shape-shifting master of darkness" during the opening narration.
Your Size May Vary: Possibly justified as given his shapeshifting, but even then his sizes varies from shot to shot. At times he's the size of a skyscraper, others he's only a few stories tall.
Voiced by: Jennifer Martin
One of Aku's aliases, just one of several forms which Aku assumed in order to travel closely with Jack while on a desert quest to find a jewel.
Foreshadowing: There are many instances in that episode of Ikra's true identity. When the shaman senses the 'ultimate evil', his last line said to Jack, "You don't understand!" After Jack and Ikra escape from Aku's robots, the robots simply stop their chase and close their eyes with satisfaction, awaring of a trickery. Then, a mouse feeds food from Jack, the mouse is scared of Ikra and digs itself to run away. There is a height difference that Ikra is slightly taller than Jack. When the jewel tests Jack and Ikra's hearts, it found out that Ikra is pure evil. The guardian mainly tries to fire its blast to Ikra (besides Jack not wanting to fight). Near the end, Ikra can fly and becoming a giant to defeat the jewel guardian.
Only appearing in 'Birth of Evil', it is the source of all evil. Before it consume the universe, three deities: Odin, Ra, and Vishnu arrive to exterminate this great evil. Before it was completely destroyed, a fragment of it escapes and landed on Earth by killing the dinosaurs. This is the original incarnation of Aku.
A large, extremely loud Scottish man, with a sword inscribed with magic runes and a machine-gun false leg. He's about as burly a warrior as you'll find, and one of the few creatures able to match Jack for combat prowess. One of the few characters who appears more than once in the series.
No Name Given: In part because Jack never asked his name. (In fact, the writers didn't bother naming his wife or his clan either.) Interestingly, he never actually refers to Jack by his name either, he refers to him as "my friend" or "laddie".
Noodle Incident: Why the Scotsman is the second most wanted person in the world, presumably for Aku, is never said. However, it can be assumed that he similarly resists Aku's rule, and his ability to hurt Aku and power similar to Jack would support that.
No Sell: In "Scotsman Saves Jack Part II", an amnesic Jack, the Scotsman, and a bunch of pirates sail the ocean, only to come within range of the song of Enthralling Sirens. Everyone on the ship becomes hypnotized, except the Scotsman. Why? The fact is that the song of the siren enchants men due to how beautiful it is to their ears. The Scotman thinks their singing is horrible.
Also the when a couple of robot alligators bite his arms, he laughs at the attempt and smashes.
Voiced by: Sab Shimono (Old), Keone Young (Young, Birth of Evil episode)
The samurai lord who accidentally awakened Aku when he tried to destroy the corruption he was otherwise unconsciously causing. The gods Odin, Ra and Vishnu forged the sword that would later become Jack's from his righteousness. He manages to seal Aku, until he returns once again to unleash evil. Apart from the first episode and the two-parter covering him awaking and sealing Aku, he mostly appears in flashbacks.
Annoying Arrows: Clearly disregards having been struck by some arrows during his fight with Aku.
Badass: Not as much as Jack, but he still defeated Aku the first time.
Three anthropomorphic dogs that are dedicated to study their ancestors. They convince the samurai to save their land from a coming beetle droid invasion. Their names are Sir Dreyfuss Alexander (Bulldog), Sir Angus McDuffy (Scottish Terrier), and Sir Colin Bartholomew Montgomery Rothchild III (Dachsund).
A race from a peaceful, utopian society who were conquered and enslaved by the Critchellites, using the power of the Black Sphere.
And I Must Scream: The Black Sphere forces the Woolies into walking like animals and preventing them from speaking.
A tribe of technology experts who were enslaved by Aku and forced to design and build his robotic forces. They've been constructing a secret escape rocket when Jack accidently leads Aku's forces to their hideout. Jack promises to help protect the group, and in return, they promise to try and help Jack return to his own time.
Shout-Out: The Astronaut in the green helmet looks very similar to George Jetson.
The Three Blind Archers
Three incredibly skilled archers who guard a magical well at the top of an old tower.
Be Careful What You Wish For: The archers are actually three wanderers who wished to become the greatest of warriors to the Spirit Of the Well. The Spirit answered the wish by robbing them of their sight and their minds, and forced them to become his guards.
Handicapped Badass: The three archers are blind, but still wipes out an entire army with no problem.
After countless defeats of bounty hunters, Aku created a dark-version of the samurai in an attempt to finish Jack fueled by pure anger. However, Mad Jack is defeated when Jack meditate to seal him off since he did not exist as a manifest of Jack's negative emotions.
Jerk Ass: Possesses none of Jack's nobility or manners.
The Lava Monster
A viking warrior whose kingdom was destroyed by Aku a millennium ago. Instead of killing him, Aku imprisoned him in solid crystal and buried him inside a mountain to deny him an honorable death. Over the centuries, he learned to shape the rock around his prison and formed a giant stone body. Now he lures other warriors to his mountain, seeking one strong enough to defeat him in honorable battle and grant him entry into Valhalla.
A group of diminutive gangsters, supposedly working for Aku, that arent very good at their jobs. They carry more than a passing resemblance to the Ant Hill Mob from The Perils of Penelope Pitstop.
Goddess of Water and The Elementals
A water godess who created a powerful jewel that can control all the worlds water supplies, and to keep it safe from Aku, she created three elemental guardians, strong enough to drive Aku off, even if they cant kill him.
Kids that are fans of Samurai Jack and are part of Aku's fairy tales.
Monkey Man and Tribe
A tribe of white-furred apes and a wild man who lives alongside them that Jack encounters after another failed skirmish with Aku.
Charles Atlas Superpower: The White Apes have an incredible ability to jump enormous distances due to a heavy training theyre put through.
Raised by Wolves: The Monkey Man was originally part of a group of humans enslaved by Aku's forces, but was accidently left behind by them as a young child, and was raised by the White Ape Tribe. He's well aware that he's human and not an ape though.
Training from Hell: The training the white apes undergo to learn their Jump Good skill that they teach to Jack, which involves jumping, running and training with boulders tied to their arms and legs as well as an enormous one on their backs.
Training the Peaceful Villagers: Jack trains the peaceful apes in nonlethal combat to help them defend themselves against an aggressive tribe of red gorillas that harasses them and steal their food. In return, they train him to Jump Good.
The Two-Headed Worm
A magical two headed worm who is said to be able to grant the wish of anyone who can guess its riddle.
The Metal Eating Family
A family of lost travellers that are actually metal eating robots.
Eight, nearly indestructible killing machines that are design by Exdor as a means to kill Jack. Aku then empowers them and test by destroying Exdor's village and other villages to lure the samurai out. It took a metal gauntlet made by Extor and divine intervention for Jack to destroy them.
More Dakka: The robots that uses projectiles for weapons uses this style of attack.
Voiced by: Jeff Bennett
The creator of the Ultra-Robots designed to kill Jack, but Aku betrays him by sending his creations to destroy his village. He seeks to redeem himself by building a metal arm for Jack to destroy the robots.
The Jailer: Demongo is a unique example; not only is he a jailer (his victims being enemies of Aku) but his body is the jail, and he can command the imprisoned souls to fight for him. (Until, that is, Jack busts them out.)
Noodle Incident: The first four warriors Demongo summons are recognized by Jack. Judging by their dialogue, he's met them before, but they have never appeared on the show prior to this.
The Minions of Set are three powerful divine beings created by the Egyptian god Set to bring violence and terror to world. Incredibly strong, fast, agile and with a healing factor that makes them nearly invincible, the Minions are among the most deadly opponents Jack ever faces. Their appearance is loosely based on the Set Animal, or Sha.
Badass: They are the personal servants of a god, and are not of the mortal world. They are stronger, faster, more agile and fight with more brutality than any opponent before them. In some ways they are even more powerful Aku, as they do not share his weakness to the power of human righteousness, shrugging off strikes from Jack's sword like it's nothing. Jack admits they are the most powerful opponents he has ever faced up to that point.
Chase Fight: Jack is unable to engage the Minions for more than a few moments at a time without being completely overwhelmed, so most of the episode consists of the Minions chasing Jack through an ancient Egyptian temple.
Combat Parkour: The Minions move with incredible grace and agility for such large and heavy creatures, and use this skill with deadly effect in battle, constantly pouncing at their opponents like animals, changing position with each other to keep their victims off-guard, performing flips and wall jumps, and even running across the tops of pillars, all with flawless precision and execution.
Combat Pragmatist: The Minions of Set have no hesitation or remorse about doing whatever it takes to kill their prey, employing brutal tactics that make merely fighting dirty look admirable. These creatures have no desire whatsoever to do battle with you. They want to kill you, and they are going to do it one way or another.
Curb-Stomp Battle: The Minions are so much more powerful than Jack that it isn't a Curb Stomp Battle so much as it is Jack being barely able to defend himself while running away in terror. Every encounter with them forces him to focus solely on defending himself, as their blitz-like battle tactics make them almost impossible to hit.
Glowing Eyes of Doom: The Minions of Set have solid blue eyes that glow more brightly whenever they become alerted or agitated during hunting.
Healing Factor/Nigh Invulnerable: The Minions have an incredibly powerful healing factor that immediately heals any wound, even the ones made by Jack's sword. Injuring them through any normal, mortal means is essentially impossible.
Implacable Man: The Minions Of Set do not stop once they set their sights on their prey. Jack is hunted down relentlessly, barely able to stop running for even for a few moments before the Minions are all over him.
No-Holds-Barred Beatdown: The main reason the Minions of Set are so fearsome is because they treat every battle like a No-Holds-Barred Beatdown. They fight with terrible ferocity and machine-like determination, and will not hesitate to mutilate practically helpless victims in their attempts to kill them.
Run or Die: Your only options when faced with immortal, unstoppable ancient Egyptian hell-beasts. And even then running only delays the inevitable.
Sealed Evil in a Can: Originally plagued ancient Egypt until the Pharaoh of the time summoned Ra and had them sealed away inside a stone sarcophagus. Aku releases them in the present to kill Jack.
Super Strength: The Minions of Set are huge and very muscular, allowing them to cut stone pillars to pieces, punch a person hard enough to send them flying through the air, and slam a person into a stone wall with enough force to leave an impression of their body in it.
The Power of the Sun: The only thing that can harm the Minions is joining together three pieces of a magical scarab, which summons Ra, the god of the sun.
The Speechless: Although they appear to be capable of understanding human speech, the Minions themselves do not speak, they only bark, growl and roar, and often drool and foam at the mouth while doing so.
Wall Crawl: The Minions are capable of running on walls and even upside down on the ceiling.
A powerful warrior that guards a time portal, waiting for The Chosen One to find and use it. When Jack finds the portal, he is told by the Guardian that he's not the one, leading Jack to try and beat him anyway.
Curb-Stomp Battle: Jack initially looks like he's getting the upperhand when he hits with his own missiles, but he just shrugs them and shows he wasn't even taking the fight seriously and beats Jack with his bare hands. The only reason he doesn't kill him is because the portal gives him a sign telling him not to.
Tennis Boss: Subverted; Jack thinks he can beat him by bouncing his missiles back at him, but he's sadly mistaken.
Time Abyss: The Guardian claims to have been guarding the time portal for "countless eons". The huge pile of rubble, debris, broken down giant robots, war machines and likely countless dead warriors surrounding the gate makes it obvious he has been doing this for a very long time.
A hulking cartoony-looking creature of limited intelligence but benevolent nature that Jack finds and unwittingly befriends during his travels. Whilst it is initially annoying, when it sees Jack in pain at the hands of a band of robot bounty hunters, it reveals a far more violent side of itself and rescues him.
Gentle Giant: It's normally sweet, docile and inoffensive, if annoyingly dimwitted. But, for the love of all that's holy, do not tick it off!
Hulking Out: When Jack is in danger, it undergoes a horrific transformation, growing several times larger, sprouting immense claws and a huge array of claws, turning red with mad-looking eyes, and having its daisies replaced by dead-looking treestumps.
The God of Time And Space. He was defeated eons ago by his son Zeus and was chained to an abandoned planet in space, while his magical gloves and helmet were hidden on Earth.
The Demon Spirit
A malicious spirit that trap the souls of a family which sets in a haunted house. Jack manages to slay the demon and freed the family inside.
Knight of Cerebus: One of the beings that is treated seriously as this creature is independent from Aku's services.
The Shaolin Monks
Practitioners of the ancient art of shaolin kung fu, hidden away in an ancient temple. The clan is in fact the same that once trained Jack, and their Grandmaster met Jack himself thousands of years before. He's still alive, now being sustained by the very Earth itself, and offers sanctuary to Jack, as the temple is shielded from Aku's view.
The Labyrinth Thief
Voiced by: Rino Romano
A nameless expert thief who is aftr the same magical diamond that Jack is.
A robotic ninja clad in black sent by Aku to destroy Jack.
A loudmouthed Mr. T expy and samurai wannabee who challenges Jack to a duel to prove he's the better fighter. Jack, of course, takes him down with no effort at all. Watching Jack fight a real threat, and his humble personality and behavior, sets Da Samurai down the path towards true enlightenment.
Fake Ultimate Hero: He earned this the hard way. Seeing Jack in action, though, kept him encouraged.
Overshadowed by Awesome: The Gentleman; I and Am; Boris; Jujunga; and Princess Mira are six interesting, well designed, badass characters, as well as six of the best Bounty Hunters in the world. too bad for them their opponent is Jack.
A retired, obsolete, prototype assassin android with emotions. He was blackmailed into targeting Jack, by Aku. Aku's leverage, he had kidnapped the one thing dear in the robot's life: His precious dog LuLu....sweet thing.
Heel Realization: Because of his emotions, he came to understand how immoral Aku was and left to live in peace, and he went largely unnoticed because Aku's evil scientists replaced the X series robots with the bug-bots seen promeniently in the series.
Heroic Bloodshed: The bot may have been serving a greater evil purpose he was still only trying to save his dog.
It Amused Me: As X9 explains, the scientist who gave him the "experimental emotion chip" did so simply because, "He was kinda funny that way."
Just a Machine: Possibly averted due to Jack's reaction after X9 muttered his dying words.
Killed Off for Real: Inevitably, after a tension-filled confrontation, Jack catches X9 while his back is turned and runs him through. Because X9 refused to back down for the sake of Lulu, Jack had no choice but to finish off X9 before the robot did the same to him. X9's final request was for Jack to find his precious Lulu and take care of her before he went offline for good.
Last of His Kind: Due to the rest of the line of robots he was part of getting scrapped in favor of the bug-bots.
More Dakka: Of the pistol variety. Only once do we see him actually taking a accurate shot.
One Last Job: The whole plot of the episode. Aku blackmails him into doing it.
The three deities that fought and exterminated the black mass eons ago, which a fragment of this evil escape and became Aku. They are the ones that help Jack's father to create the sword that can slay Aku.Ra is also summoned to save Jack from the Minions of Set.
Big Good: They're the only thing Jack has to offer prayer to.