IgnisA group of six AI with free will created by Kogami during the Lost Incident/Hanoi Project, ten years prior to the start of the series. They are based on each of the six Attributes of Duel Monsters, and are the progenitors of the Cyberse-Type.
- Body Motifs: Besides the obvious pun, the AI are heavily associated with eyes, appearing as one in their simplest form as Ai was before he regained his body, and Windy was reduced to an eye after getting hit by Hanoi's virus. Earth's decompiled data is kept in Onizuka's eye as part of his brain chip.
- Colour-Coded for Your Convenience: They are all colored after the attribute they are based on.
- Creative Sterility: Accused of so by Revolver, who points out they have no imagination, as they are taken by surprise in duels. Considering how surprised Ai and Flame tend to be with their partner's plays and are unable to keep up with them, he has a point.
- Deader Than Dead: None of the Ignis, barring Ai, return to life even after Playmaker defeats Bohman a final time, as shown when Ai (in his humanoid form) silently mourns the Ignis, who all have tombstones dedicated to them.
- Face Death with Dignity: With no hope of salvation, Flame and Aqua, assimiliated into Bohman, accept their inevitable fate of complete termination, but not before passing on their powers to Ai to take down Bohman one last time.
- Foil: All the Ignis are foils to their human origins in terms of personality. Since these AIs were created from their Origin's personalities as children, these contrast shows how much they were changed by the traumatizing event.
- Ai is a Plucky Comic Relief who likes to joke around while his Origin Yusaku is very serious, no-nonsense, and cold. While Ai likes to befriend other AI's, Yusaku is a loner and prefers to avoid making friends because he doesn't want them to get involved in his conflict.
- Flame is overconfident, proud and has big ego while his Origin Takeru is timid and tends to look up to other Duelists.
- Earth is very serious, calm, honest, and The Spock while his Origin Spectre is very manipulative, sadistic, and takes pleasure in others' sufferings.
- Living MacGuffin: All of them are wanted by the Knights of Hanoi and SOL Technologies because they remain a threat to humanity. The former wants to destroy them, while it's claimed the latter wants to use them as profit for their business (until Kengo discovers what they really intend to do with the Ignis).
- Meaningful Name: Because their true names are unpronounceable by humans, with the exception of Ai, all of the Ignis are named after their attributes. Ai named half of them, while Flame named himself, Earth named Aqua, and Yusaku and Kusanagi named Ai. As Ai put it:Ai: Be quiet! Easy to understand is priority!
- The FIRE Ignis is Flame.
- The WIND Ignis is Windy.
- The EARTH Ignis is Earth.
- The WATER Ignis is Aqua.
- The LIGHT Ignis is Lightning.
- Personality Powers: The Ignis are shown to each excel in a different aspects befitting their attributes.
- Ai is a case of Dark Is Not Evil, and very carefree and goofy. He also is the wisest of his brethren, despite his goofy demeanor overshadowing it. He also can change his form to absorb the data of his opponents who lost a duel.
- Flame is very hot headed and serious, and displays a tendency to spontaneously combust when excited.
- Windy is shown to be fairly laid back and flighty, and is the Ignis with the strongest control over the Data Storms.
- Earth is very reserved, but also headstrong, blunt, and socially awkward. He also has the ability to shrug off pain as if it were nothing, and is immensely strong.
- Aqua is very nurturing and calm, but just as ready to Dope Slap Ai for his stupid stunts. She can easily discern truth from lie just by interacting with someone.
- Lightning is very analytical and a quick-thinker, considered the smartest of his brothers, enough for him to be their unofficial leader. He also can summon forth bolts of Lightning, easily create complex programs, and move faster than a bolt of his namesake.
- Psychic Link:
- They are connected to their Origins even if they never met each other as shown when Earth gets terminated and his Origin, Spectre, cries without knowing why. This is also the reason why Lightning and Windy had to terminate their Origins. Lightning did this by turning Jin into his puppet while Windy caused his Origin to be part of a traffic accident which either severely injured or even killed him.
- The Ignis can also sense when another Ignis spends their final moments before they're completely terminated.
- Shadow Archetype: The Ignis appear to develop various similarities and differences in personalities from their original partners.
- Ai has wisdom and instinct just like Yusaku, except he is more playful, while Yusaku himself is more brusque and serious.
- Flame is energetic and courageous just like Takeru as Soulburner, except he is more confident, while Takeru himself in the real world is more humble and quiet.
- Earth is socially awkward and protects what's important to him with fierce devotion just like Specter, except he is more caring towards others, while Specter himself can be cruel and sadistic at times.
- Lightning is calm and collected just like Jin, except he is also arrogant, cold and manipulative, while Jin himself is very aloof and withdrawn.
- Aqua is kind and cares about her friends just like Miyu, except she is more calm and cautious, while Miyu herself was more carefree and adventurous as a child.
- True Companions: They all care and love each other dearly, They even consider Ai to be this despite finding him annoying. Deconstructed with Windy and Lightning. They do care for the other Ignis greatly, but are still willing to deconstruct and brainwash the others if they don't share the two's disdain for humanity.
- The Unintelligible: They have their own language, also called Ignis, which is incomprehensible to the human ear.
- What Measure Is a Non-Human?: Despite having free will, how much they are truly alive varies per person and is also part of the conflicts they have against humanity:
- They themselves see them as living beings that have a right to life peacefully.
- SOL Technologies don't see them as living beings, but rather as objects as shown with what they did to Earth after capturing him which they even called a dissectionnote .
- The Knights of Hanoi do acknowledge them as living beings, but for the same reasons also see them as a threat to humanity.
- Yusaku's view of them changes as the series went on. He first only saw Ai as an object who was only programmed to keep himself from harm, but acknowledges them as living beings after learning they have free will and along with Ai tries to create the most peaceful solution to the conflict between humanity and Ignis.
AiA mysterious AI program, sought after by the Knights of Hanoi and SOL Technologies Inc., that Yusaku, Ai's Origin, captures. Belongs to an AI species with free will, known as the Ignis, and is based on the DARK Attribute.
FlameAn Ignis who was created from and is partnered with Takeru Homura, and is based on the FIRE Attribute. The pair visit Yusaku and Ai after being informed that the Cyberse World was destroyed.
AquaAn Ignis who was created from Miyu, a childhood friend of Aoi's. Based on the WATER Attribute, she is partnered with Blue Maiden (i.e. Aoi's third Online Alias).
Voiced by: Chihiro Suzuki (Japanese)
One of the six Ignis created by Kogami. He is based on the WIND attribute.
Windy uses a "Stormrider" deck, an archetype of WIND Cyberse-Type Monsters which revolve around a Lockdown playstyle, preventing the opponent from using cards in their Spell & Trap zone by destroying or negating them and punishing them for summoning Link monsters with a higher Link Rating than Windy's own.
- An Arm and a Leg: Lightning saves him from being deleted by the Knights of Hanoi, however he still loses loses both his arms and legs, as well as his eye.
- Anti-Magic: The Stormrider cards revolve around destroying and negating spells and trap cards, and likewise don't let him have cards in the spell and trap card zones during some of his effects.
- Arrogant Kung-Fu Guy: Windy scoffs at Revolver after the latter fails to negate his own "Magic Cylinder" (which Windy took control of and used against Revolver) and takes 3000 damage from it (leaving him with 300 LP remaining), claiming that he's nothing but all talk when it comes to terminating the Ignis, and has zero chance of defeating Windy.
- Blow You Away: He is an Ignis based on the WIND Attribute, with his entire body being primarily light green, a colour also commonly associated with the wind element. His command over the Data Storm is also appropriately stronger than Ai's to the point that he can even use Storm Access outside of a Speed Duel.
- Blue and Orange Morality: Windy thought Revolver secretly resented his father since Dr. Kogami didn't choose him to be a part of the Lost Incident experiments because his father didn't believe he was worthy. Experiments involving electrocution and starvation.
- Brought to You by the Letter "S": His new Eyepatch of Power has a W on it for Windy.
- Cool Ship: Windy's Stormrider monsters resemble bird and Flying Fish-themed ships.
- Everyone Has Standards: While he refuses to directly aid them, he does provide relevant support to the heroes by agreeing to clear the path towards the villain base. Subverted when he proves to be a villain and likely planned it.
- Eyepatch of Power: Gains one after his defeat by Revolver.
- Gallows Humor: Used a monster that destroyed his home as the basis for a prank.
- Giant Flyer: The Stormrider monsters are based upon mythological fliers such as the Roc or griffon, but are abominations with fins and various other additions.
- Hidden Depths: Yusaku alleges that Windy may or may not be up to something after the gate to his world was closed after Bohman's defeat. Yusaku's suspicions turn out to be true; Windy is revealed to be cooperating with Lightning to not only rebuild a Cyberse World beyond human reach, but also rule over humanity from within.
- Impaled with Extreme Prejudice: After he is defeated by Revolver in their Master Duel, the latter (along with his subordinates) proceeds to terminate him by impaling him with spikes... only to be saved by Lightning at the last minute.
- Loophole Abuse: Like Bohman (during his Master Duel against Playmaker), Windy also activates his Skill, Storm Access, in his Master Duel against Revolver after his LP was reduced to below 1000.
- Properly Paranoid: Refuses to find the kid used to create him because he believes that humans in general cannot be trusted. Given that one of the victims is Spectre, his paranoia is well placed. Subverted in that he took out his Origin by causing a car accident.
- Red Eyes, Take Warning: Unlike Ai and Flame, Windy has red eyes. Before Lightnings reprogramming, his eye color used to be purple.
- Tension-Cutting Laughter: His very first scene upon his proper introduction is him laughing his butt off after the heroes get a taste of his dry sense of humor.
- Wind Is Green: His body is mostly light green and he's the WIND Attribute Ignis.
Voiced by: Fumihiro Okabayashi (Japanese)
One of the six Ignis created by Kogami; is based on the EARTH attribute. His Origin is Spectre.
Earth uses a "G Golem" deck, an archetype of EARTH Cyberse-Type Monsters which revolve around a beatdown play style, swarming the Field with Monsters to Summon stronger ones and overwhelm the opponent with brute force.
- Ain't Too Proud to Beg: As he dies, he begs them to stop erasing him as his memories of Aqua fade, screaming that he has free will.
- Catchphrase: "I am socially awkward."
- Crazy Jealous Guy: He doesn't appreciate Ai trying to get friendly with Aqua, and even confronted him at one point and warned him to stay away from Aqua; Earth himself insisted that only he has the privilege of protecting Aqua."Stay away from the Water Ignis! I'll protect her!"
- Cruel and Unusual Death: After he is defeated by GO, captured and turned in to SOL Technologies, his body is gradually lasered bit by bit until he is completely terminated.
- Deader Than Dead: Revolver affirms that Earth cannot be restored to his former state since SOL Technologies converted him into source code that can be easily understood in human terms due to their inability to fully comprehend the Ignis algorithm.
- Dishing Out Dirt: He is an Ignis based on the EARTH attribute, with his entire body being primarily orange and brown, a colour commonly associated with the earth element.
- A Dog Named "Dog": An Ignis based on the EARTH attribute named Earth.
- Exact Words: He dueled Yusaku on the condition that if the latter won, he would give all information he knew about Bohman. As it turns out, the only information he knew about Bohman was that he knew nothing about him, and after losing the duel, he answered truthfully in that regard.
- Fate Worse than Death: Episode 81 reveals that his decomplied data is now fused with GO's AI chip. Go now has Earth's deck in his database and uses Crystal Heart to his advantage while Ai, Flame and Aqua can only look on with horror.
- Four Is Death: The fourth Ignis to be introduced in the series and the first one to be terminated (courtesy of SOL Technologies).
- Generation Xerox: He and Spectre both run EARTH Attribute Stone Wall decks that focus on protecting a certain card, and even end up losing to Playmaker the same way: By having their ace card lose all of their attack points by Playmaker's card effects, leaving them vulnerable to a LP Wipe. However, unlike Spectre, Earth succeeded in protecting his card "Crystal Heart" when Playmaker defeated him while Spectre's "Sunavalon Dryatrentiay" was destroyed twice.
- Graceful Loser: Earth accepts his defeat to Playmaker without any hard feelings, and reveals what he knows about Bohman's whereabouts... except he knows nada about Bohman himself.
- Killed Off for Real: In Episode 76, Ryoken tells Ai and Yusaku that Earth has been decomplied into a source code SOL Technologies can understand. He won't be able to be restored back to his former self if such a feat is possible.
- No-Sell: All of his co-linked Monsters are unaffected by his opponent's Monster Effects while he controls "Invalid Dolmen".
- No Social Skills: Earth himself points out his lack of social skills by reiterating from time to time that he is socially awkward, and doesn't communicate in any more than a few words per sentence.
- Rock Monster: His "G Golem" Monsters are golem-styled Cyberse-Type Monsters.
- Sacrificial Lamb: Earth's death demonstrates that SOL Tech is no longer playing around, and just how dangerous and depraved Onizuka has become in his quest for power.
- Shared Family Quirks: Earth makes a dueling AI out of a dead tree, making Playmaker believe Earth is Spectre's Ignis. Also, when both Link Summon, their circuits do not appear in the sky like everyone else's, but on the ground.
- The Spock: Earth finds the best solution to a situation is the straightforward, logical answer. He duels Yusaku/Playmaker to find out if he and Ai are a good reason to side with humans or not.
- Stone Wall: Earth's general playstyle involves using "G Golem Invalid Dolmen" in order to prevent his opponent from penetrating his defenses and destroying "G Golem Crystal Heart" in battle.
- This Is Unforgivable!: He holds Lightning in contempt for harming Aqua and destroying Cyberse World.
- What Measure Is a Non-Human?: Despite his free will, SOL doesn't care, and heartlessly dissects and kills him.
- You Shall Not Pass!: Takes on Go Onizuka in order to buy Aqua time to flee.
Voiced by: Issei Maeda (Japanese)
One of the six Ignis created by Kogami. Is based on the LIGHT attribute. His Origin is Jin Kusanagi.
- Armor-Piercing Question: Noting Ai's attachment to humanity, Lightning questions the stability of said relationship and whether or not Ai completely believes that humanity won't be out to try and terminate him.
- Give Me a Reason: While he could have protected Windy from being attacked by the Knights of Hanoi after the latter loses to Revolver, he chose to wait until the last possible moment to do so, when Windy was nearly erased. This is so he has a reason to justify declaring war on humans, as a form of "retaliation" for said attack.
- A Lighter Shade of Black: By his own admission, he's not as cruel as Windy, who chose to eliminate his Origin. He's still all too willing to enslave his own origin, Jin, instead, and talk to him as if Jin could respond, knowing full well he took Jin's free will.
- This is ultimately subverted, as Lightning reprogrammed Windy and made him serve as his ally, with Windy showing no signs of hostility towards humans prior to that.
- Big Bad: In his duel with Revolver, he admits to being the cause of pretty much everything that's gone wrong over the past 10 years, including infecting Dr. Kogami with a computer virus, mentally damaging Jin during the Lost Incident, and altering Windy's program to corrupt his personality.
- The Leader: Ai considers him this, he's described as calm, cool and collected which fits the leader role.
- Light 'em Up: He's an Ignis based on the LIGHT attribute, with his body being primarily light yellow, a colour commonly associated with the light element.
- Light Is Not Good: Lightning is an Ignis based on the LIGHT attribute, and is up to no good as shown when he reveals his intentions to rule over humanity within a newly constructed Cyberse World that is beyond human reach.
- Shock and Awe: He's an Ignis named Lightning, and also commands control over lightning, as seen when he attempts to blast Revolver with a bolt of lightning, which Revolver casually swats off.
- Significant Double Casting: He shares the same VA as the leader of Bowman and Haru's faction. He also possesses an AI resembling a shadowy figure with an outline of light, eerily similar to the leader's appearance as a silhouette shrouded in light, implying and then confirming that Lightning is the true leader of the faction.
- The Smart Guy: Ai also said he's too smart and because of that he can't understand him.
- Villain Has a Point: Given what SOL Technologies did to Earth, and the impending threat the Knights of Hanoi are to their species, Lightning isn't unjustified in his argument that humans are dangerous.
- Villainous Rescue: A variant, he saves Windy from being deleted by the Knights of Hanoi at the last possible moment, so he can justify his declaring war on humanity.
- Xanatos Gambit: He stakes one on the outcome of Windy and Revolver's duel. If the former wins, he'll see it as evidence that humans are inferior to the Ignis and should be subjugated by them. If the latter wins, he knows that Revolver will attempt to erase Windy and can use it as evidence that humans pose a threat to the Ignis, framing it as a premise to declare war on humanity with the goal of subjugating or exterminating them. Either way, he has a valid means to justify his position that the Ignis are superior to humans and should rule over them.
OriginsOrigins are the kids the Ignis are based on. All of them were kidnapped to partake in the Lost Incident/Hanoi Project. They were forced to duel against AI opponents and if they lose, they would gets electrocuted and get less food, forcing them to continue to duel until they win. They were freed after six months of captivity, however their hardships were far from over since they still had to live with the trauma they suffered.
- Ambiguous Disorder: As a result from the Lost Incident/Hanoi Project, they got many mental problems and disorders.
- Dark and Troubled Past: They all had to suffer the Lost Incident/Hanoi Project which as mentioned above included electrocution and starvation. Some of them even have other kinds of troubles in their past.
- Denied Food as Punishment: If they didn't win against the AI opponent, they wouldn't get food.
- Electric Torture: Whenever they lose a duel, they got shocked.
- Kidnapped by the Call: They were all kidnapped to partake in the Hanoi Project.
- Psychic Link: They share one with their designated Ignis.
- Sadistic Choice: In the Lost Incident their choices were to keep dueling and get shocked when losing or starvation if they don't duel.
Voiced by: Ryota Suzuki (Japanese)
Jin is the Origin of Lightning, The LIGHT Ignis, and Shoichi Kusanagi's younger brother. Like Yusaku, he was also one of the children kidnapped during the events of the Lost Incident/Hanoi Project, and is still shook from the incident, unable to escape captivity.
- Aloof Dark-Haired Girl: Male example; he has long dark hair, and is very stoic and aloof most of the time.
- Ambiguous Disorder: He is heavily implied to suffer the same problem as Yusaku. Like Yusaku, he is still suffering from the shock of the incident and PTSD and hasn't recovered from it until the Lost Incident/Hanoi Project was brought to a closure.
- Broken Bird: His Dark and Troubled Past in which he was imprisoned as a child and underwent a hellish experiment has made him this, unable to bring himself to escape from captivity due to the severe trauma he experienced.He gets much better after losing his memories of the Lost Incident.
- Break the Cutie: Prior to his kidnapping which saw him being badly tortured and made him close off his heart to the world, he was just a normal, cheerful guy.
- Cynicism Catalyst: His trauma is what drove Yusaku to fight for him and become vengeful towards Hanoi.
- Dark and Troubled Past: Along with Yusaku, he was one of the six children abducted during the Lost Incident/Hanoi Project. Though the project's purpose remains a mystery, he remains traumatised in the present day.
- Distressed Dude: Getting his consciousness taken away basically starts the conflict of Season 2.
- Dull Eyes of Unhappiness: Highlighting the trauma that he suffered during the Lost Incident/Hanoi Project. Even though he gets better after the Lost Incident/Hanoi Project was brought to a closure, his eyes remain dull and lifeless. Apparent in episode 64 where his eyes were dull as shown in Kusanagi's flashback.
- Emotionless Boy: Heavily implied to be more emotionless than Yusaku and the Hanoi project has made him an Empty Shell. He doesn't express any emotion at all every time he is seen.
- Empty Shell: The Hanoi Project and all the hell and torture he went through made him suffer even worse than Yusaku, shaken over the incident and unable to leave. He gets better after he is informed that the Lost Incident/Hanoi Project was brought to a closure... only for Bohman to appear shortly after and suck his soul away, leaving Jin a lifeless husk. His consciousness is then suppressed and he is made into Lightning's aide. He gets much better in Season 3 after losing all his memories of the Lost Incident and is no longer a lifeless shell.
- The Ghost: Initially, he was mentioned by Yusaku and Kusanagi multiple times since the start of the show and was seen only in flashbacks, until he finally makes his first direct appearance in Episode #47, when Kusanagi visits him for a checkup.
- Hope Spot: Lightning subjected him to this multiple times during captivity, showing him a simulation of people coming to rescue him only to transform into monsters. This ended up shattering his psyche.
- Laser-Guided Amnesia: After being rescued from Lightning, doctors note he has no memory of the Lost Incident whatsoever, allowing him to make a much swifter recovery. Yusaku and Kusanagi speculate that the piece of Jin's consciousness that Lightning used to survive his duel with Revolver contained said memories, and that by holding on to them, he accidentally freed his origin of the trauma he himself caused.
- The Stoic: He is often seen with a dull, emotionless expression, and rarely smiles.
- Strong Family Resemblance: He looks a lot like a younger version of his older brother.
- Used to Be a Sweet Kid: Kusanagi described him as gentle and cheerful before the incident.
- The Voiceless: While he gets much better after he is informed that the Lost Incident/Hanoi Project was brought to a closure, he doesn't talk at all.
- Yank the Dog's Chain:
- Just when you thought things were getting much better for Jin after he is informed that the Lost Incident/Hanoi Project has been brought to a closure, an unknown yellow figure (later revealed to be Bohman) sucks his soul away and escapes into LINK VRAINS.
- During the Lost Incident Lightning shows him simulation of people coming to rescue him only to transform into monsters.
- You Gotta Have Blue Hair: Purple like his brother's, but a brighter shade.
Voiced by: Natsumi Fujiwara (Japanese)
A childhood friend of Aoi's, and the Origin of Aqua, the WATER Ignis. In her childhood she was Aoi's Only Friend, but they had to separate after Aoi took the blame for losing her mother's ring. Miyu still remembers that event and wants to meet with Aoi again. She's currently in a coma, because of a virus Lightning planted inside of her, forcing her Ignis Aqua to team up with Aoi to cure her.
- Break the Cutie: In one day Miyu lost her mother's ring and her friend Aoi took the fall so she wouldn't get in trouble with her mother, who then banned her from seeing Aoi again. Later Miyu would go through the Lost Incident and all that entailed before ultimately being rendered comatose by Lightning's virus.
- Cheerful Child: Miyu was energetic and kind, easily befriending the shy and reserved Aoi.
- Childhood Friend: She was Aoi's only friend before she was dragged away by her mother, who warned Aoi not to get involved with her daughter ever again after Aoi takes the blame for losing her ring.
- Convenient Coma: She's in a comatose state due to a computer virus installed in her by Lightning. Aqua's attempts to remove the virus failed, though she did retrieve a fragment of Miyu's memories. She regains her consciousness after Playmaker defeats Bohman a final time.
- Dark and Troubled Past: She is one of the victims of the Lost Incident. Despite the hardships she endured as a subject of the Hanoi Project, she never relented, and kept fighting so she could escape from captivity and apologise to Aoi over the lost ring mishap. However, it's not known what happened to Miyu ever since she was rescued from captivity up until Lightning put her in a comatose state.
- Determinator: Despite the hardships she endured as a victim of the Lost Incident, she nevertheless stood her ground and fought to the very end, vowing to escape and apologise to Aoi over the day Miyu lost her mother's ring.
- Genki Girl: Miyu was an energetic Cheerful Child with cutesy behavior, making her similar to Aoi's behavior as Blue Angel.
- Girlish Pigtails: Miyu began to wear her hair in pigtails after she and Aoi last met, and continued to wear them like such throughout the Lost Incident.
- Only Friend: Aoi never had any friends in her childhood until Miyu came into her life.
- The Smurfette Principle: She's the only girl of the Lost Incident victims/Origins.
- Break the Cutie: Just like the other victims, he was an innocent kid that got tortured and starved during the Lost Incident. His case is turned Up to Eleven however when years later Windy, the Ignis made from him, instigated a car accident in an attempt to kill him.
- Dark and Troubled Past: He is one of the six victims of the Lost Incident, and years after the incident he's involved in a reckless driving accident orchestrated by Windy.
- The Faceless: He is finally shown in episode 88, but his face is partially shadowed.
- The Ghost: The only Origin not seen in the present day in any way.
- Hope Spot: He is shown to have been able to move on from his trauma of the Lost Incident and live a normal life, only for Windy to steal it away by instigating a fatal car accident during a blood moon.
- No Name Given: His name is unknown.
- Uncertain Doom: After the accident orchestrated by Windy, his fate is left unknown. Windy and Team Nagi however all operate under the belief the accident killed him.
Creations/Minions of the Ignis
Voiced by: Minami Takahashi (Japanese)
Yusaku's robot maid, and Ai's "minion."
Starting from the third season, Roboppi uses an "Appliancer" deck, an archetype of Machine-Type monsters based on common household appliances, with the Link Monsters boasting a variety of effects revolving around whether or not they are co-linked.
- Alas, Poor Villain: Roboppis defeat is treated as a tragedy, as they are unable to handle Ai's system and overload, reverting back to their original form and mentality, while lying malfunctioning on the ground. Even when Soulburner gives them a Mercy Kill, they remain blissfully unaware of what was happening.
- Ambiguous Gender: Roboppi has a very feminine-sounding voice as a robot. Combined with their function as a robot maid as well as a certain scene with Ai, Roboppi was presumed female by the Western fans. The Japanese side was more divided due their use of the masculine pronoun "oira". After obtaining a human form however, Roboppi was depicted as an androgynous child. Not helping the matter is realizing that in the end Roboppi is still an robot which means it wasn't even supposed to have a gender in the first place and that they are only considered a male after being affected by Ai's backup program which gives the possibility his gender was a result from Ai's data.
- Artificial Intelligence: After Ai revived with a backup during Playmaker's duel with Bohman, it somehow caused Roboppi to develop free will as well.
- Ascended Extra: Becomes a free-willed AI and Ai's sidekick in Season 3.
- Bowdlerise: Provides this in-universe, where they claim that "idiot" or some variation thereof is a forbidden word. Dropped after being a free-willed AI, claiming that good children can say it.
- Catchphrase: "Idiot is a forbidden word."
- Clingy Jealous Girl: They were jealous of Linkuriboh and both developed a rivalry over both being Ai's "minions".
- Combat Commentator: To Ai's annoyance when he duels Queen, constantly stating the obvious.
- Deconstructed Character Archetype: Of the machine who Grew Beyond Their Programming. In Season 3 Roboppi gained more intelligence and free will thanks to Ai's systems which allowed him to become more like a person, but the fact remains that Roboppi is an AI made to run a simple household cleaning robot, and as a result he couldn't handle the upgrade which caused him to malfunction and break down until Soulburner was forced to Mercy Kill him.
- Famous Last Words: Just before Roboppi is about to be obliterated by Heatleo's attack.
- Insufferable Genius: As a result of his upgrade from linking to Ai's program, they turn into this since their mentality can't grow as fast as their intelligence.
- Keet: In season 3 Roboppi develops a personality and free will, adopting the persona of a very enthusiastic and cheerful child.
- Lovable Sex Maniac: It seems like their only reason for going against orders is so they can robo-bang Ai. And that's even before developing free will.
- Mercy Kill: Soulburner was forced to kill him when he finally couldn't handle Ai's system and as a result glitched and malfunctioned.
- Power Degeneration: Ai's program may have given Roboppi more intelligence, but in the end Roboppi is still a simplistic AI made for household chores; thus, his program breaks down during the duel, forcing Soulburner to Mercy Kill him.
- Red Eyes, Take Warning: The activation of Ai's backup caused Roboppis eyes to turn red.
- Robot Maid: They're programmed to clean Yusaku's house, but thanks to Ai's influence, they started to do other things...
- Satellite Love Interest: For Ai, though a more literal and justified example than most, since Roboppi's limited personality and independence only emerge through interacting with Ai in secret. Upon gaining free will they act more like an Annoying Younger Sibling.
- Spell My Name with an "S": Is it "Roboppy" or "Roboppi"? At first it was believed to be the former, but the current subs in Season 3 say it's the latter.
- Yes-Man: Roboppi follows Ai's command at all times, not bothering to question his authority.
Voiced by: Ryunosuke Watanuki (Japanese)
An AI program created by Windy.
- Eldritch Abomination: First appears as a monstrosity which appears to be the same exact one responsible for destroying the Cyberse World... but it all turns out to be a childish prank by Windy.
- Meaningful Name: There are multiple Echoes, allowing them to serve as Mooks to be decimated by the Three Knights and Spectre.
- Mooks: There are multiple Echoes, several of which fight the Knights of Hanoi, four in particular ganging up on Spectre, though all are easily decimated.
- No Face Under the Mask: Echo's head consists of a hollow loop with a mouth floating inside of it.
- Shapeshifting: Echo has shown the ability to change shapes as shown when it first appeared in the form of the monster responsible for destroying the Cyberse World.
- The Unintelligible: Windy has programmed him to be able to speak Ignis, as shown in Episode 68. It's shown to be digitized gibberish.