Yui Kasuga

A high-school student who assumes the secret on-line identity of "Corrector Yui".

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• Ascended Fangirl
• Brown Eyes
• Cute Clumsy Girl
• The Ditz
• Genius Ditz: She's a very good artist and illustrator, but at first she can't handle computers to save her life.
• Genki Girl
• Hair Antennae
• Heroic BSOD: Has three short ones in the first season.
• The Heroine
• "I Know You're in There Somewhere" Fight: To Corrector Haruna, and later to Grosser/Shun.
• Jumped at the Call
• Light Feminine and Dark Feminine: The light to Ai's dark.
• Male Gaze: She has... really nice hips. And a big ass. And her Transformation Sequence puts a LOT of emphasis on both.
• Otaku Surrogate
• Screw Destiny: She wasn't the Chosen One in the first place, thanks to a mistake done by IR. However, at the time she reunited all the other programs, she eventually wasn't JUST leading the correctors, but also she befriended them so much that she wasn't going to let them down completely at the lone leadership of Haruna.
• The Unchosen One: Professor Inukai had Haruna in mind for being the human corrector leader of the correctors, but Grosser intercepted IR to make Yui the chosen one of sorts.
• Zettai Ryouiki

Haruna Kisaragi

Yui's best friend from high school. She was supposed to be a Corrector, but I.R. confused her with Yui, thanks to Grosser's intervention.

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• Bare Your Midriff
• Brainwashed and Crazy: In the first season.
• The Chosen One: She was supposed to be the real corrector in charge of finding the Software Programs, but thanks to Grosser, the one chosen was Yui.
• Dark Magical Girl: When controlled by Grosser.
• Evil Costume Switch
  • Good Wings, Evil Wings
  • Opera Gloves
  • Paint It Black
  • Thigh-High Boots
• Idiot Hair
• Invisible Parents: Her parents appear off-screen in the series. It's assumed that they are so busy that they are rarely home. However, in the manga they do appear when Haruna falls commatose when being manipulated by Grosser.
• Manipulative Bitch: However, she turned out to be manipulated herself by someone that used her emotions of jealousy against her.
• Meaningful Name: 'Kisaragi' is the old way to calling February (modern-way is Ni-Gatsu) in Japan. Since, in kanji it does means 'month to wear more clothes', February 3rd is the festival of Setsubun, the day in which it is finally changing of seasons. Old folk stories said it was due because it was said to bring out the devils. It does makes sense why Haruna gets and Angel-Motif Elemental Suit and why its counterpart is a Devil.
• Missed the Call: She was supposed to become the first Corrector, but that went to Yui instead.
• Mission Control: In season two, when Yui fails victim of a Boggles infection.
• Nice Hat
• Rose-Haired Girl
• Shrinking Violet: She slowly gets better, especially after she starts opening much better with help of Yui.
• Silk Hiding Steel
• Team Mom: She is like this in her circle of friends, and gets much more into that role at the almost end of season one helping Yui and the correctors in the Final Battle with Grosser, and towards season two when she is not a corrector.
• Zettai Ryouiki

Ai Shinozaki

A mysterious girl who becomes a Corrector on her own in season 2. She is daughter of scientist Shintaro and Azusa Shinozaki, who becomes a corrector because she has to find a mysterious little girl that is the retainer of the Boggles virus (and who is her father's creation), and is also the clue of where her mother really is.

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• Aloof Ally: She is more capable of handling a virus alone since the VERY beginning in comparison from Yui, or say, Haruna.
• Aloof Dark Haired Girl: She is tall, beautiful, dark-haired and aloof.
• Anti-Hero: She is seen like this mostly from the perspective of Yui and the other correctors, because she wants to act alone and not with help of them. But as the time progresses, she changes her view about working alone.
• Beauty Mark: Has one very close to her mouth.
• Broken Bird: Her dad died when she was a child, and she starts growing up as a colder person to the point that she doesn't have friends. Not only that, but people don't like her because she seems too perfect when it is otherwise. And not so much later, her mother falls into a comma...
• Dark Magical Girl
• Defrosting Ice Queen: Thanks to Yui, mostly.
• Eerie Pale-Skinned Brunette
• Light Feminine and Dark Feminine: The dark to Yui's light.
• One Way Visor
• Proper Tights with a Skirt: Her Elemental Suit, the Love Suit, is based in the outfit of a maid.
• Purple Eyes
• The Snark Knight: Sometimes. Especially when Yui or the Correctors are around.
• Tall, Dark and Snarky
• Used to Be a Sweet Kid

Control

Corrector Software #1, The Regulator. His element motif is Wind. He was found by Yui in a Science Fiction MMORPG net disguised as a Space Pirate called Shadowcat.

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• Bishounen
• It's All About Me: Heroic example, as he's very egocentric but has a good heart underneath.
• Jerk with a Heart of Gold: At the start he didn't even like Yui, and also wanted to work at his own rhythm. Hhowever, he started to open up when he assimilated that Yui was more a leader than he was. He also does care about the others, even when they don't obey his orders.
• The Lancer
• Peek-A-Bangs
• Shout Out: His Shadowcat disguise is a homage to Leiji Matsumoto's Captain Harlock.
• White-Haired Pretty Boy

Synchro/War Wolf

Corrector Software #2, The Synchronizer. He has the power of Fire. He is the last software to be found since he was under the identity of War Wolf, one of Grosser's Fearsome Four, after an incident that saved the Professor's life. Under the identity of War Wolf, he is a skilled combat fighter, and retains his snarky side towards his companions and the correctors, especially Yui. Synchro eventually returns to his War Wolf identity thanks to the infection of the Boggles virus at the start of season 2.

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• Ambiguously Brown
• Big Badass Wolf: As War Wolf.
• The Big Guy: He is more open to prefer direct combat with other enemies.
• Bodyguard Crush: Sometime before returning to his original identity, he started developing some feelings on Yui. It was that one of the triggers that made him eventually return to his former self. Later, he proves to be also loyal to her and even if she still bothers him with an Affectionate Nickname, he can't be mad at her just because of that.
• Brainwashed and Crazy: As War Wolf in season 1. He gets into that identity because he was protecting the life of the Professor, and Grosser wanted him to become one of his corruptors, thanks to his stubborness and courage.
• Cool Sword: His main weapon that reminisces a Jedi light saber. No wonder, since Asamiya is a Star Wars fan.
• Tall, Dark and Snarky
• You Gotta Have Purple Hair

Ante

Corrector Software #3, The Predictor. She has the Wind elemental power in her. When the Professor dispersed the correctors for their own sake, she took the role of a popular fortune teller, whose site was later corrupted by Grosser.

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• Seer: She falls mostly in the Fortune Teller side, since she sees the future (and because she assumes that role hiding from Grosser. Most of the times, her predictions are accurate, but with Yui... they are more unexpected to her.
• Silk Hiding Steel
• Team Mom
• You Gotta Have Green Hair

Eco

Corrector Software #4, The System Maintainer. His element motif is Water. He becomes the mysterious protector of the Nature Net after the Professor dispersed the eight Software Programs.

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• Adorably Precocious Child
• Bratty Half-Pint
• Green Thumb: He is the protector and controller of Nature', since Ecology is also the motif of his name.
• Making a Splash: Especially having the Water Elemental Power.
• Refusal Of The Call: It took Yui quite the effort to recruit him, since he has a loyalty to his Disappeared Dad, Professor Inukai, but then he starts to like her, when she proves to be mature. This is again shown when Haruna was re-recruiting the correctors, but now it was thanks to the loyalty he had to both the professor AND Yui.
• The Resenter: Mostly towards Synchro... especially for burning the forest he protects when he was War Wolf.
  • In fact, this is something that was more used in the Okamoto manga, since it's the trigger of tension between him and Synchro that Haruna, manipulated by Grosser, uses to try to disperse the already-reunited team.
• Wholesome Crossdresser: In the manga, he was disguised as a girl who is taking care of the Nature Net just to trick Grosser and his minions.

Rescue

Corrector Software #5, The Repairer. Her Elemental power is related to Water. During the disperse of the correctors, she was hidden in the Medical Net, seeking the Professor in her own.

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• The Chick
• Genius Ditz: Very childish, but she's an excellent medic, and a really good trickster.
• Green Eyes
• Hair Antennae
• Hair Decorations: The sort of halo she has above her head, is also a virus radar.
• The Medic: She has curative powers related to the Water element.
• Silk Hiding Steel
• Wrench Wench: Besides being a medic, she is a very good traps builder.

Peace

Corrector Software #6, The Archiver. His motif is Fire, something very ''ironic'' since he does not approve violence. He was, alongside Follow, in a remote island hidden in the Marine Adventure Net.

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• Badass Grandpa: In appeareance he is the oldest corrector, but, even if he is peaceful, he can build well-efficient weapons for the security of his teammates.
• Genius Bruiser
• Grumpy Old Man
• Jerk with a Heart of Gold: He can act very reluctant at times, but if he is meaning to do his work, he does a lot for his teammates.
• Nice Hat
• Technical Pacifist: As in ironic, since he also represents Fire (an element related to violence) and he builds weapons.

Follow

Corrector Software #7, The Compiler. His elemental power is Earth. He was, alongside Peace, in a remote island hidden in the Marine Adventure Net.

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• Big Beautiful Man
• Big Fun
• Eyes Always Shut
• Shape Shifter: He even sometimes take the role of The Trickster because he can change into any form, from human to animal especially when bothering Control in a Spy-themed episode, taking the form of Ante just because she didn't have the time to accompany him.
• You Gotta Have Light Blue Hair

I.R.

Corrector Software #8, The Installer. He has the Earth elemental power. He was the one who Professor Inukai sends to look for the human corrector who will reunite the Software Programs and stop Grosser.

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• Japanese Honorifics: He's always talking in a polite manner to Yui (Miss Yui, Yui-dono), and also says 'Thank You' a lot at the end of his sentences.
• Mentor Mascot
• The Smart Guy

Grosser

Leader of the Corruptors. And also the main system who controls the whole ComNet.

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• Batman Gambit: How he manipulates Haruna to separate Yui from her Corrector friends and control her.
• Beautiful All Along: In the Okamoto's manga, at the very last change of mind, he turned out (or transforms into thanks to Yui) to be a Bishōnen.
• Big Bad: Of Season 1.
• I Just Want to Be You: It is... a bit more creepy in the manga. He does not want Yui to be his wife... he WANTS to be her.
• Mailer Daemon: His subconscious met Yui and became amazed by (and obsessed with) her when she was a little girl.
• Pinocchio Syndrome: As pointed above, he wants to know how is living as a human.
• Stalker with a Crush: To Yui.
• Villainous Crush: He wants Yui to be his puppet girlfriend/wife.
• We Can Rule Together: To Yui.

Freeze

The only female Corrupted Software on Grosser's Fearsome Four team. She has the ability to freeze anything.

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• Brainwashed and Crazy: In the second season, after failing her main mission of finding the Little Girl, the minion of the Final Boss manipulates her to become a more evil version of her previous corruptor self to do a more serious take in finding the Little Girl.
• Chickification: In the second season, since her role as a villain ended in the previous one.
• Cute Clumsy Girl: More applied in the second season, since she is always losing her jobs.
• Dark Action Girl: In the first season.
• Dark Chick
• Evil Redhead: In the first season. And an episode of the second season.
• An Ice Person: Her main occupation and persona. It's a reason that why she is named Freeze.
• The Smurfette Principle

Jaggy

The most knowledgeable of Grosser's henchmen despite his bulk size and his strength. Most of his tactics including manipulating the environment to do his bidding (though most of it didn't do so well). In the second season, he becomes the library administrator.

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• Badass Bookworm
• The Brute
• Genius Bruiser

Virus

The most intelligent of Grosser's henchmen. He is armed with primarily a light saber and computer viruses. His computer viruses can be used to corrupt other programs and make them do his bidding. In the second season, he works as a virus computer researcher.

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• Anime Hair
• The Evil Genius

Takashi Fuji

Yui's childhood friend and Haruna's love interest. He is a boy who likes sports.

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• Jerk with a Heart of Gold: He doesn't seem that nice with Yui, because he bothers her all the time; but given that they are childhood friends, he cares for her deeply.

Akiko Yanagi

One of Yui's best friends from High School. She is an ecologist at heart.

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• Girlish Pigtails
• Those Two Girls: With Reiko.
• Tomboy and Girly Girl: She is more tomboy than Reiko, who is more feminine.
• You Gotta Have Green Hair

Reiko Kan'onzaki

One of Yui's best friends from High School. She is someone who likes to know and visit novelty and popular sites with her friends.

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• Belligerent Sexual Tension: She is in an constant love-fight relationship with Ichitaro, but she truly loves him.
• Those Two Girls: With Akiko.
• Tomboy and Girly Girl: She is the Girly Girl to Tomboy Akiko.
• Tsundere: Type B towards Ichitaro.
• You Gotta Have Purple Hair

Ichitaro Ishikawa

One of Takashi's best friends, he is also a computer geek and fan of MMORPGs and Science Fiction.

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• Belligerent Sexual Tension: He is in an inestable love-hate relationship with Reiko, he likes her so much, whatsoever.
• Jerk with a Heart of Gold
• Megane
• Those Two Guys: He and Hideto falls into this, sometimes.

Hideto Kobayashi

One of Takashi's best friends.

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• Spell My Name with an S: In the Latinamerican dub, Hideto's name is never accurate, sometimes he is called Bento or Beto...
• Those Two Guys: He is often displaced alongside Ichitaro in preference to Takashi.

Manami Sayama

Yui's Titular Teacher, who has a childish personality that is problematic for her own students.

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• One Of The Kids: Her childish personality is responsible to this when her students are around.
• Sensei Chan

Professor Mototsugu Inukai

The creator of the Eight Software Programs and Grosser, and father of all ComNet. He attempts to stop Grosser by sending Correctors, but he is left comatose after Grosser finally caught him.

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• Big Good
• Heroic Sacrifice: In the first season he is the one who was trying to stop Grosser in the first place by trying to kill himself, but the thing resulted in Synchro saving him. As a last effort, he prefers to sacrifice his memory, until the 8 Software Programs are reunited again.
• The Professor
• Quest for Identity: After being saved by Synchro and sacrificing his own memory, he starts in the middle of nowhere not knowing who he is, but he has the hunch of being someone important and that he is searching for some people.

Shun Tojo

An engineering/medical student who lives alongside Yui's house. He is Yui's love interest and Ai's cousin.

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• Distressed Dude: In the end of season one, he was abducted by Grosser, as bait to lure Yui and the other Correctors to battle him in his lair.
• Oblivious to Love
• Put on a Bus: In the second season it's mentioned that he went to America to keep studying Medicine.

Shinichi Kasuga

Yui's father and a computer programmer. He is the designer of Fantasy Net and Marine Adventure Net.

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• Doting Parent
• Overprotective Dad

Sakura Kasuga

Yui's mother.

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• Hot Mom
• Supreme Chef

Azusa Shinozaki

Ai's mother and widow of Shintaro Shinozaki. At the beginning of season two, she's comatose, thanks to an accident that severed the connection between her mind and body. She is one of the group of scientists that were behind the creation of ComNet.

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• Convenient Coma
• Damsel in Distress: She is trapped inside ComNet by Ryo Kurokawa, and at the end of the series, Ai must rescue her.
• Hot Mom
• Ill Girl

Shintaro Shinozaki

Ai's deceased dad. His death is the reason of why Ai is the way she is in the present. He is also one of the scientists behind ComNet's creation alongside Mototsugu Inukai and Ryo Kurokawa.

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• Almost Dead Guy: He created Ai-chan as a message container for his daughter when she was a kid, before dying.
• Disappeared Dad: He died when Ai was a child, 10 years ago.

Feena/Hoe Hoe

A little but rebellious whale who has the most melodious voice in all the Marine Adventure Net's ocean.

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Missing Little Girl/Ai-chan

A little girl who is always seen with a teddy bear when the Boggles virus is around. She is the creation of Shintaro Shinozaki, as a fairytale character made for her daughter, Ai, and was created as a messenger for her. However, Ryo Kurokawa experimented with her and she became the host of the virus. Her bear is the one who recruits Ai Shinozaki as a corrector.

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• Girls Love Stuffed Animals: She has a talking stuffed animal companion.

Mysterious Man

A man who is working in the fairytale simulation, as a performer for a "Sun, Wind and Traveler" story drama, as the traveler. He asks Freeze to search for the "missing little girl", claiming he wanted to return her home, with one condition; that she shouldn't talk about it with anyone. He promised a large sum of reward money for Freeze, stopping her from asking too much about the job.

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• Brainwashed and Crazy: He was a minion of Kurokawa, but at the end he was just being manipulated by him to find Ai-chan.
• No Name Given

Ryo Kurokawa

He is one of the scientists that was originally behind the creation of ComNet, however he left at earlier stages of this because his ideas clashed with Inukai's and Shinozaki's. He was also a good friend of Azusa but at the end she confronted him, knowing what he was doing (creating the Boggles virus).

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• Tomato in the Mirror: He was Dead All Along... with his mind trapped inside ComNet while his body, involucrated in the same accident as Azusa, was found lifeless.