Characters / Summer Wars

WARNING: This page may contain unmarked spoilers. Read at your own risk.

Main Characters

Kenji Koiso

^{Click here to see his second OZ avatar, Polly Possum}

Voiced by: Ryunosuke Kamiki (JP), Michael Sinterniklaas (EN), Eduardo Curiel (LA)

A student from Kuonji High School with a talent for mathematics, Kenji works part-time as a moderator in internet Metaverse Oz. His crush Natsuki invites him to her great-grandmother's nintieth birthday, where she introduces him to her family as her fiance. His talent for cracking codes and equations plays a role in the AI Love Machine's invasion of the internet. His online avatar resembles him in appearance, but sports a pair of mouse ears.

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• Achievements in Ignorance: Kenji receives what he thinks is a mathematical equation that needs solving online, and he solves it. The "equation" was security codes for Oz's systems and cracking them let Love Machine in to run riot. Sakuma reveals he actually got the code wrong by one letter, and that everyone who responded to the equation mass email had their accounts stolen by Love Machine like Kenji's regardless if they solved it or not.
• Alliterative Name: Kenji Koiso.
• Animal Motifs: Kenji's guest avatar on the Jinnouchi home phone is a cartooney squirrel.
• Badass Adorable: His second Avatar is a cute, chubby squirrel, which he uses to math duel Love Machine.
• Badass Bookworm: Kenji hacks and cracks multiple codes with two-hundred plus numbers to solve.
• Badass Pacifist: Kenji doesn't participate in any physical violence throughout the film, either in real life or in Oz. Instead, he uses his incredible math skills to stop Love Machine.
• Becoming the Mask: After posing as Natsuki's boyfriend/fiance and getting exposed the next day, Kenji ends up with Natsuki by the end of the film.
• Big Good: Takes over as leader of the good guys after Sakae dies.
• Blue with Shock: When finds out the equation he cracked was Oz's encryption code.
• Chekhov's Skill: His mathematical genius helps gain access to the center of Oz so Kazuma can take out Love Machine.
• Good with Numbers: Nearly won a national maths competition. His skills come to help save the world by solving a 256-bit encryption in his head and typing while he solves it.
• Heroic BSoD: Shares one with the Jinnouchis when Sakae dies, and when King Kazma is absorbed by Love Machine.
• Ink-Suit Actor: He greatly resembles his Japanese actor Ryunosuke Kamiki as well as his English one, Michael Sinterniklaas.
• Intertwined Fingers: Holds hands with Natsuki to help her deal with Sakae's death.
• Look Behind You: Pulls this on Love Machine to rescue King Kazuma from being absorbed.
• Nice Guy: Kenji is shown to be friendly, polite, and even-tempered and never loses his temper with any of the Jinnouchi family.
• Nice Job Breaking It, Hero: Kenji thinks he hacked into Oz's code. Sakuma confirms he didn't, but Love Machine stole all the accounts of those who tried to solve it.
• Nosebleed: Occurs due to the mental stress of trying to solve a very long encryption code and the more traditional take occurs when Natsuki kisses him in the film's finale.
• Official Couple: Kenji gets together for real with Natsuki by the film's end.
• Parental Abandonment: He mentions his parents work difficult jobs and have no time for him. He expresses happiness that he got to spend time with a proper family even if it wasn't his own.
• Savvy Guy, Energetic Girl: With Natsuki. In this case computer savvy and "silly goose" antics.
• Smooch of Victory: Natsuki gives Kenji one at the end of the film after he saves the day.
• Squishy Wizard: He's a Non-Action Guy as far as the cyber war goes, but he's enough of a math genius to solve an extremely complex, government-level encryption in his head in order to stop Love Machine's final attack.
• Teen Genius: A mathematical genius and possibly good with computers, given his job at Oz.
• Took a Level in Badass: Achieves this by solving an encryption code in his head in a matter of seconds.

Kazuma Ikezawa

^{Click here to see King Kazma}

Voiced by: Mitsuki Tanimura (JP), Maxey Whitehead (EN), Wendy Malvárez (LA)

Natsuki's 13-year old cousin. A quiet kid, Kazuma spends his time playing online gaming as the popular avatar King Kazma.

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• All of the Other Reindeer: Implied for Kazuma when his mother comments on he was viewed as an outsider during his childhood. In contrast to King Kazma, who is one of the most popular avatars on Oz.
• Animal Motifs: Rabbits, given his avatar is a humanoid-like rabbit.
• Badass Adorable: A shy teenager who plays online as a street fighter rabbit and knows martial arts in real life.
• Bare-Fisted Monk: King Kazma fights with bare-handed martial arts.
• Barefoot Cartoon Animal: King Kazma, who appears as an anthropomorphic rabbit. His upgrade comes with no shoes, making him a more effective fighter.
• Big Brother Instinct: Expresses disinterest in gaining a little sister but still comes to be protective of his mother and unborn sibling.
• Breakout Character: Gained his own spin-off manga.
• Chekhov's Gunman: As the creator of King Kazma, who is seen in the opening credits fighting other avatars and is even advertised on trains.
• Curb-Stomp Battle: Kazma's first match against Love Machine becomes one after the AI absorbs other avatars and grows stronger, not helped by Kazuma's little cousins distracting him during the fight.
• Deep-Immersion Gaming: Very dedicated to his games, and feels and acts like he is personally fighting Love Machine.
• Deer in the Headlights: After Love Machine raises up a black monstrosity, both Kazuma and King Kazma are too frozen with shock to respond.
• Deuteragonist: To Kenji's protagonist and Natsuki's tritagonist.
• Dynamic Entry: Uses this on Love Machine to protect Kenji's squirrel avatar.
• Funny Animal: King Kazma is a bipedal rabbit.
• Goggles Do Nothing: King Kazma wears goggles as an accessory, but then wears them around his neck in the upgrade.
• Headphones Equal Isolation: Kenji first meets Kazuma while he wears these; outsider, you know?
• Heroic BSoD: When Love Machine breaks out of the Jinnouchi-laid trap as a giant monster and assimilates King Kazma.
• I Know Mortal Kombat: Inverted. Kazuma and Mansuke actually are quite skilled at martial arts in the real world, and they are somehow able to apply these skills inside Oz.
• Jerk with a Heart of Gold: Kazuma is withdrawn and snarky, but he's ultimately a good kid.
• Kung-Fu Kid: Taught by Mansuke in martial arts, which he applies to King Kazma.
• Megaton Punch: Seen striking an armoured lobster avatar with this early in the film. Delivers a spectacular one to Love Machine that destroys the AI.
• Momma's Boy: Kazuma seems quite close to his mother, although she is the only parent he is seen with until his father arrives in the finale.
• Not So Stoic: Remains The Stoic most of the time, but freaks out when Shota fries the supercomputer, and again when Love Machine assimilates King Kazma, causing him to break down in tears.
• Pre-Mortem One-Liner: He yells "That's enough!" before he kills Love Machine for good.
• The Quiet One: The quietest of the Jinnouchi family.
• Rapid-Fire Typing: Pretty good at it when gaming. Martial arts are quick, after all.
• Righteous Rabbit: Serves as the main muscle to fight Love Machine.
• So Proud of You: Kazuma's unnamed father praises him at the end of the film.
• Teen Genius: Knows a fair deal about computers and Oz.

Natsuki Shinohara

Voiced by: Nanami Sakuraba (JP), Brina Palencia (EN), Jocelyn Robles (LA)

A close friend to Kenji, who he has a crush on. She invites him to celebrate her great-grandmother's ninetieth birthday and forces him to pretend they are dating. Has a talent for hanafuda games, and has a crush on her uncle Wabisuke. Her online avatar resembles her but has features of a dog or doe.

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• All Girls Want Bad Boys: She had a huge crush on Wabisuke. She gets over it and falls in love with Kenji instead.
• Animal Motifs: Dogs, given her Avatar is basically a dog version of herself.
• Badass Adorable: As represented by her avatar playing a hanafuda game with the world at stake.
• Break the Cutie: Sakae's death sends Natsuki into Heroic BSoD for awhile.
• Chekhov's Skill: Her hanafuda skills are essential in defeating Love Machine.
• Cool Big Sis: Gives off these vibes towards her younger cousins. She’s very patient and is excited to see them when they first show.
• Dude Magnet: Both Kenji and Takashi have crushes on her.
• Heroes Love Dogs: Natsuki's avatar is a dog version of her.
• Heroic BSoD: Clearly has one when Sakae dies.
• Ink-Suit Actor: Like Kenji, she resembles her actresses Nanami Sakuraba and Brina Palencia.
• Intertwined Fingers: Asks Kenji to hold hands with her to help her deal with Sakae's death.
• Light Is Good: Natuski's upgraded avatar gives her the appearance of a winged, anthropomorphic priestess dressed in white.
• Meaningful Name: "Natsu" means "summer".
• Modesty Towel: Runs into Kenji during his first day at Sakae's house and invokes this trope.
• Morality Pet: Wabisuke is quite fond of Natsuki and actually listens to her.
• Mundane Made Awesome: Natsuki's hanafuda match with Love Machine online involving her whole family, which is then boosted when a third of the internet's users join her in the game and she receives an avatar upgrade from Oz's guardians.
• Nice Girl: Natsuki is sweet and polite girl, with a deep love for her family. And eventually, Kenji.
• Official Couple: Faked by Natsuki at first with Kenji, but it becomes official at the end of the film.
• Peacock Girl: Gains wings and a peacock tail when her avatar is upgraded.
• Precocious Crush: On Wabisuke, her uncle, when she was younger.
• Rule of Cool: Natsuki's avatar upgrade is purely cosmetic (though there is a theory that it influences the RNG through a "luck" stat).
• Savvy Guy, Energetic Girl: Her relationship with Kenji. In this case computer savvy and "silly goose" antics.
• Single Woman Seeks Good Man: Natsuki ultimately falls in love with Kenji after witnessing his determination, courage, and leadership in protecting the family and defeating Love Machine.

Jinnouchi Family

In General

Yukiko Shinohara Voiced by: Kiyomi Tanigawa (JP); Anastasia Muñoz (EN)

Kazuo Shinohara Voiced by: Mutsumi Sasaki (JP); Bill Jenkins (EN)

Mariko Jinnouchi Voiced by: Mieko Nobusawa (JP); Shelley Calene-Black (EN); Vivian Magos (LA)

Riichi Jinnouchi Voiced by: Takuya Kirimoto (JP); Chuck Huber (EN); Rolando de la Fuente (LA)

Rika Jinnouchi Voiced by: Sakiko Tamagawa (JP); Cynthia Cranz (EN); Dolores Mondragón (LA)

Mansuke Jinnouchi Voiced by: Ichirō Nagai (JP); John Swasey (EN); Carlos Segundo (LA)

Tasuke Jinnouchi Voiced by: Takashi Kobayashi (JP); John Burgmeier (EN)

Shota Jinnouchi Voiced by: Yutaka Shimizu (JP); Mike McFarland (EN), Hugo Núñez (LA)

Naomi Miwa Voiced by: Kaori Yamagata (JP); Lydia Mackay (EN); Diana Pérez (LA)

Kiyomi Ikezawa Voiced by: Tagame Tamura (JP); Jennifer Seman (EN)

Mansaku Jinnouchi Voiced by: Tadashi Nakamura (JP); Barry Yandell (EN); Hugo Navarette (LA)

Yorihiko Jinnouchi Voiced by: Yoji Tanaka (JP); Robert McCollum (EN); Carlos Mireles (LA)

Kunihiko Jinnouchi Voiced by: Hashiya Nakamura (JP); Patrick Seitz (EN)

Katsuhiko Jinnouchi Voiced by: Mitsutaka Itakura (JP); Christopher Sabat (EN)

Noriko Jinnouchi Voiced by: Eiko Kanazawa (JP); Colleen Clinkenbeard (EN); Jenny Medel (LA)

Nana Jinnouchi Voiced by: Chigusa Takaku (JP); Caitlin Glass (EN)

Yumi Jinnouchi Voiced by: Riisa Naka (JP); Monica Rial (EN); Karla Vega (LA)

Ryohei Jinnouchi Voiced by: Naoto Adachi (JP); Jason Liebrecht (EN)

Yuhei Jinnouchi Voiced by: Rikito Ota (JP); Brittney Karbowski (EN)

Shingo Jinnouchi Voiced by: Yuki Imai (JP); Alison Viktorin (EN)

Mao Jinnouchi Voiced by: Sumire Morohoshi (JP); Cherami Leigh (EN)

Kana Jinnouchi Voiced by: Hinano Minagawa (JP); Tia Ballard (EN)

Kyohei Jinnouchi Voiced by: N/A

Hayate Voiced by: N/A

Natsuki's extended family who come together to celebrate Sakae's 90th birthday, but end up playing a role in battling Love Machine. The family were once rich and a powerful clan in the 17th Century, but Sakae's husband lost it all leaving them with only a Big Fancy House. However, most of the family members work in handy jobs (doctor, IT technician, sailor, cop, JGSDF member).

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• Amazingly Embarrassing Parents: They have their moments. Mansuke and Mansaku (Sakae's sons) both ask Kenji if he and Natsuki have done it. Then the whole family forces Kenji and Natsuki to kiss in the finale.
• Apron Matron: Mariko, the eldest and only daughter of Sakae's three biological kids. While she isn’t as fierce as Sakae herself, she still manages to help with Love Machine.
• Badass Family: Hell yeah! They will stop at nothing to halt Love Machine. Mansuke is very proud of the achievements of the clan's ancestors, fighting off seven-thousand soldiers loyal to the Tokugawa shogunate. Sakae has samurai armour and a number of weapons on display in her house. Most members of the family have badass skills or work in jobs in connection to Japan's society.
• Big Brother Instinct: Shota towards Natsuki, despite being cousins, by way of My Sister Is Off-Limits.
• Big Fancy House: A large ancestral home on the outskirts of Ueda, though it is all that is left of the Jinnouchi fortune.
• Big "WHAT?!": When they realize that Love Machine's countdown timer hasn't stopped after Natsuki wins her hand in Hanafuda.
• Bratty Half-Pint: The younger kids, who end up costing Kazuma his first fight against Love Machine by jumping on him and then saying "you got hit!" in an annoying tone.
• Butt-Monkey: Shota is treated like a nuisance throughout the film.
• Chekhov's Skill: Every member of the family's skills or occupations come into use in some shape or form during the film.
• Children Are Innocent: The younger members of the family, who maintain an innocent outlook on things in the film even when they are at their worst.
• Chubby Mama, Skinny Papa: Yumi and Katsuhiko. Justified Trope on Katsuhiko’s end as he has a job that involves a lot of moving.
• The Clan: They still consider themselves one three-hundred years on even though they only own one house.
• Cool Old Guy: Mansuke, who taught his reclusive gaming grandson martial arts to protect him from bullies.
• Cool Old Lady: Mariko, Sakae's daughter, who plays her part by bringing the family together for a meal.
• Determinator: The whole family refuses to lose even after Sakae's death.
• Evil-Detecting Dog: The family dog Hayate can sense the satellite approaching when it is in orbit.
• Family Business: Averted. Mansaku is a doctor, but his three sons all work for the fire department.
• Fiery Redhead: Naomi has a her moments.
• Heroic BSoD: When Sakae dies just days before her 90th birthday, the entire family goes into shock.
• Jerk with a Heart of Gold: Shota acts like a jerk most of the time but he is a very loving guy.
• Modesty Towel: Kenji was surprised when two of the youngest Jinnouchi family members jump out of the bath tub.
• Multigenerational Household: Subverted. Only Sakae lives in the ancestral home, and everyone else comes to visit.
• My Sister Is Off-Limits: Shota objects to Kenji and Natsuki's "relationship" on principle alone. He's actually Natsuki's cousin.
• Nice Job Breaking It, Hero: Shota removes the blocks of ice that are cooling a supercomputer to keep Sakae's body in good condition (which is good on paper), allowing Love Machine to escape the Jinnouchi trap and plot to destroy a nuclear plant with a satellite!
• Passionate Sports Girl: Yumi is a big supporter of her son Ryohei who appears in an ongoing baseball tournament on TV.
• Please Wake Up: The family's reaction when Sakae dies is disbelief.
• Police Are Useless: Shota is a cop but not a very competent one.
• Red Oni, Blue Oni: Tasuke and Shota in a father-son take on the trope.
• Shipper on Deck: The whole family for Kenji and Natsuki at the end of the film. Two of them literally push the bashful couple together and say they should be engaged for real.
• Smart People Wear Glasses: Tasuke, who runs an electronics store, wears glasses.
• What the Hell, Hero?: Kazuma gives one to Shota in the form of a punch in the face, after his foolishness causes the supercomputer to overheat and the "Flood the Castle" trap falls apart.
• Virtual Danger Denial: Most of the family don't understand the internet being taken over by Love Machine until after they verbally hear it will target nuclear facilities with a satellite.

Sakae Jinnouchi

Voiced by: Sumiko Fuji (JP), Pam Dougherty (EN), Anabel Méndez (LA)

The 89-year old matriarch of the Jinnouchi family, Sakae is about to turn 90 and her extended family come from far and wide to celebrate. One unflappable Cool Old Lady, Sakae puts family first and is a very loving grandma.

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• Armor-Piercing Question: Gives one to Kenji when she first meets him.
  Sakae: Are you man enough to die for her (Natsuki)?
  Kenji: Yes.
• Big Good: An absolute gem of this trope. Believes strongly in a tight family, cares for others, and calls up old friends and authority figures to help get Japan's systems back up and running while encouraging them to do their best.
• Break Out the Museum Piece: When Oz's systems fail, Sakae calls up friends, family, and acquaintances with nothing but her trusty dial up phone, an address book, and land lines.
• Cool Old Lady: One of the best ever. She may be turning 90, but she keeps her cool throughout the chaos going on thanks to Love Machine, loves her family, rallies her friends to help others, and can even handle a heavy bladed naginata against Wabisuke.
• Dead Man Writing: Grandma Sakae leaves a note to the family with her wishes on how they should carry on after her death: welcome the prodigal son Wabisuke back into their home and stay strong together as a family.
• The Determinator: Won't let Japan just bend over backwards to a systems failure and manages to get the whole of Japan's services up and running using a dial up phone.
• Excellent Judge of Character: It is implied that no one marries into the family without her approval because of this. When she meets Kenji, she recognizes that he has a good heart and approves of him even after it comes out that him dating her granddaughter was a lie and proof comes out that he might have been responsible for unleashing Love Machine. She did not hold it against Wabisuke that he was the product of her husband's affair and didn't hold a grudge when he ran off with a chunk of the family's fortune until it comes out that he was the one that create Love Machine and endangered millions of lives selling it to the US military.
• Flower Motifs: Morning glories hold sentimental value for Sakae, namely because of when she first met and adopted Wabisuke.
• Gondor Calls for Aid: Sakae uses her address book and a rotary dial phone to bring order to Japan.
• Good Parents: Sakae raised her three biological children, Mariko, Mansaku and Mansuke, and they all turned out great. She took an immediate shine to Wabisuke as a boy and adopted him on the spot, even if he was proof of her husband's infidelity. Despite feelings of not belonging in the family, Wabisuke clearly loved Sakae very much.
• Happy Birthday to You!: Meant to be sung to Sakae by her family on her birthday. It still is but at her funeral on her birthday.
• Ink-Suit Actor: Her facial features resemble a white-haired version of her Japanese voice actress, Sumiko Fuji.
• Lady of War: Takes no prisoners if angered, threatening Wabisuke with a naginata.
• Mama Bear: To her family, particularly Wabisuke. One of the first things she asks if is if he has eaten.
• Mentor Occupational Hazard: After rallying her family, coordinating her country, and inspiring Kenji, she passes away in her sleep thanks to Love Machine switching off her heart monitor.
• Mundane Made Awesome: Her use of her old rotary dial phone to get her entire country running during a crisis.
• Never Mess with Granny: Particularly when it comes to family because she has a naginata.
• Parental Substitute: She was a surrogate mother figure to Wabisuke, who was a product of his father's affair.
• Please Wake Up: The family's initial reaction to her death is disbelief.
• Rousing Speech: Pretty good at this, bringing order back to the nation by encouraging everyone in her address book to lend a hand. Happens again in the form of her farewell message.
• Screw the Money, I Have Rules!: She doesn't take Wabisuke's revelation he created Love Machine and sold it to the US military to make some money for the family very well.
• Silk Hiding Steel: When Sakae tells politicians and CEOs to put their big boy pants on and get stuff done, she is very polite and encouraging. She might have "raised a little hell" in the process, but she wouldn't know anything about that.
• Yamato Nadeshiko: Sakae is an old-school Japanese lady in a kimono. In addition to the polite "hell raising" scene, she makes sure her family stays fed and wields a naginata.

Wabisuke Jinnouchi

Voiced by: Ayumu Saito (JP), J. Michael Tatum (EN), Manuel Pérez (LA)

The Black Sheep of the Jinnouchi family. Wabisuke is the illegitimate son of Sakae's late husband whom she adopted. Ten years ago, he stole a large amount of the family's money to make it in America. He mysteriously returns to the family on the eve of Sakae's 90th birthday.

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• The Atoner: Comes back to stop Love Machine after Sakae dies, clearly driven by guilt.
• Black Sheep: Wabisuke is the illegitimate child of Sakae's husband, and ran off with much of the family's money to make it big in America. His return is unexpected and unwanted by everyone but Natsuki and Sakae.
• Evil Cannot Comprehend Good: Well, calling him evil would be a huge exaggeration, but still, he greatly misestimated Sakae's reaction when he thought that she would be proud of him for winning money to bring back the family's glory days thanks to the conception of a dangerous AI that endangered a lot of people's lives.
• Evil Uncle: In the eyes of the Jinnouchis save Natsuki, he is a scoundrel (though, obviously, he is not an "uncle" to some of them).
• Freudian Excuse: Sells off his portion of grandpa Tokue's inheritance in order to fund his computer science education in America. His family believes he did it selfishly but it was actually so he could land a contract with the US military to bring wealth back to his family. Self-conscious about his bastard origins, he was just looking for a So Proud of You moment from his adoptive mother Sakae. Plus, the manga hints that even during his childhood some members of the Jinnouchi family had a hard time accepting him because of his origins, which fueled his desire to prove himself.
• Happily Adopted: Zigzagged; Sakae took him in as her own without question, but Wabisuke went unwanted by the rest of the family because of his illegitimacy. A desire to finally be accepted is what drives his actions.
• Heel Realization: Wabisuke comes to realize his culpability in Love Machine's rampage when he learns of Sakae's death.
• Heroic Bastard: The heroic part doesn't come until the final act, but he is definitely an illegitimate child.
• Hidden Heart of Gold: He wanted to use the money he gained while creating Love Machine to bring back the glory days of the family.
• Ink-Suit Actor: He looks a lot like his actor Ayumu Saito.
• Jerk with a Heart of Gold: He may be openly rude towards most of the family save Natsuki, but he does care about them, especially Sakae even after she dies.
• Karma Houdini: Sure, he isn't responsible for the government releasing Love Machine on Oz but because he developed it, he almost caused The End of the World. In the ending, he is just mentioned in the news as the man who developed Love Machine, and is supposedly living a normal life. Presumably, he's let off the hook for playing a role in defeating Love Machine.
• Meaningful Name: Wabisuke literally means, "the penitent one." His entire character arc is paying back the family and saving them despite his mistakes.
• My God, What Have I Done?: After Natsuki tells him that Sakae has been killed, Wabisuke races straight back to the house to grieve with the family and helps put an end to Love Machine once and for all.
• Never My Fault: Insists that the American government is at fault for Love Machine's attack on Oz because they chose to test it out there, regardless of the fact that he designed the AI. At least, until he learns it indirectly killed Sakae.
• Nice Job Breaking It, Hero: His actions in creating Love Machine ensured that it caused Sakae's death. Though to be fair, most of the family didn't realize how monstrous the AI was until it was too late.
• Not Evil, Just Misunderstood: He created Love Machine, a volatile AI that is basically a weapon of mass destruction, solely for the money. Not money for himself, but so he could pay back the money he took from the family with interest and restoring their fortune.
• Practically Different Generations: Is the half brother of Mansuke, Mansaku, and Mariko but is implied to be between the ages of their children and Natsuki.
• The Reveal: He created Love Machine.
• Sour Outside, Sad Inside: That aloof, smarmy attitude is just a mask to hide how much growing up rejected by his family has hurt.
• Token Evil Teammate: Downplayed. He's not evil but is the most morally ambiguous of his family.
• Took a Level in Kindness: Helps his family defeat Love Machine and confesses to his crimes of inventing the A.I.
• Unwitting Instigator of Doom: His creation of Love Machine ends up indirectly causing Sakae's death. He thought he was helping his family at the time.
• "Well Done, Son" Guy: As the illegitimate child of her husband, Wabisuke feels this way and wants to make Sakae proud. Everything he did was for Sakae and to make the family prosperous again.
• What the Hell, Hero?: The family are livid when he reveals he created Love Machine, particularly Sakae, who comes at him with a naginata.

Allies

Takashi Sakuma

Voiced by: Takahiro Yokokawa (JP), Todd Haberkorn (EN), Marc Winslow (LA)

Kenji's school friend and fellow Oz moderator. His avatar is a monkey with a large pixelated head.

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• Deadpan Snarker: He responds to learning his friend is accused of being the terrorist responsible for the chaos in Oz in a dry tone when Kenji tries contacting him for help. Explicitly, "please tell me you didn't break the internet..."
• Mission Control: Acts as this for Kenji, coordinating the Jinnouchi counterattack on Love Machine from his dorm room.
• Nerd Glasses: He's so computer-nerdy that his glasses also appear on his avatar.
• Nonstandard Character Design: His avatar, which appears as a monkey with a huge pixelated spectacled head — which doesn't need a body half the time.
• Rock–Paper–Scissors: He used this with Kenji on who would go with Natsuki. He lost.
• Visual Pun: His avatar reflects his role as a "Code Monkey".
• Voice with an Internet Connection: Since he isn't physically with the rest of the cast most interactions with him need to be either on the phone or through Oz.

Antagonists

Love Machine

Voiced by: N/A

The Big Bad of the film. An AI created by Wabisuke, Love Machine is released on Oz by the American government as an experiment, and begins causing havoc online and in Japan's systems. It has an ability to assimilate other Oz avatars and change its appearance.

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• A.I. Is a Crapshoot: Love Machine is a privately created AI who escapes from the army and starts a war with the real world. Then this is subverted in that it was released intentionally, and was following its programming the entire time.
• The Assimilator: Can absorb the avatars and accounts of other Oz users, becoming stronger and altering his appearance.
• Back from the Brink: Love Machine ups the ante on everyone several times over the course of the film, including two instances where its cheating makes victory seem all but impossible.
• Big Bad: As the film's main antagonist, the AI is responsible for wreaking havoc online and is trying to throw the world into chaos for his amusement.
• Blood Knight: Enjoys games and competition, taking on any challenger.
• Captain Ersatz: Of Diaboromon; a self-evolving Mon-like Computer Virus from Cyberspace that wreaks havoc on the real world through the internet, growing more powerful after ever attempt to destroy it until it eventually becomes a nigh-unstoppable Body of Bodies. By the end, it tries Cutting the Knot by trying to kill the humans trying to stop it (Diaboromon with nuclear missiles, Love machine with a satellite).
• Card-Carrying Villain: Programmed to cause trouble, and although it think it is just playing games, it is a sore loser.
• Colony Drop: It plots to drop the Arawashi on a nuclear reactor. After losing the hanafuda match to the Jinnochis, Love Machine resorts to aiming the satellite at their house.
• The Computer Is a Cheating Bastard: In-universe example. Love Machine will follow the game rules until it loses, then will resort to cheating.
• Computer Virus: Love Machine is a malignant piece of malware designed to mess with whatever system it's in, treating whatever software it finds as game pieces. It manifests after hacking Kenji's account and stealing his avatar, going on to do the same with every other avatar in OZ before it really starts causing problems.
• Curb-Stomp Battle: It trounces King Kazma the first time they fight due to Kazuma's cousins distracting him.
• Cute as a Bouncing Betty: An experimental US cyberweapon nicknamed "Love Machine" and decorated with hearts. As the trope page shows, this whimsicality is very much Truth in Television.
• Dark Is Evil: His enormous multi-avatar form is huge and black, but comes with red eyes and mouth.
• Evil Is Petty: Love Machine tends to cause havoc for sheer amusement, treating every OZ account as a plaything and causing chaos in the real world by messing with accounts used for essential services (such as causing traffic jams, creating false alarms with emergency services, shutting off heart monitors, and even dropping satellites onto nuclear power plants), and is also willing to cheat and Rage Quit if it's losing games against someone else. This trope is what makes Love Machine so dangerous and terrifying, because it's completely indiscriminate in its actions. Whether it's causing minor inconveniences or endangering lives, everything is just one sick and twisted game to it.
• Gone Horribly Right: The US military probably didn't expect Love Machine to do so much damage to the world.
• Hair-Raising Hare: After absorbing King Kazma, Love Machine sprouts huge rabbit ears.
• It Amused Me: Love Machine doesn't cause destruction out of malice but rather because it sees everything as a game and was programmed to do so.
• Jerkass: It's ruthless and willing to cause violence for his own amusement to the point that it sends the Arawashi down to kill the Jinnouchi family.
• Killer Rabbit: Its an incredibly destructive AI named Love Machine, puts heart symbols on whatever form its using, and first appears using the protagonist's tiny Mickey Mouse inspired avatar. While it does get more fearsome looking avatars later on in the movie the trope still shows up when absorbing King Kazma makes this a bit more literal.
• Look Behind You: Kenji tricks Love Machine with this to rescue King Kazma.
• Meaningful Name:
  • Wabisuke intended to use it to make Sakae proud of him, and prove he's worthy of her love.
  • Ironically, despite the song's lyrics, Love Machine doesn't work for anyone but itself. In fact, since it tries to hijack everyone's accounts, it could be said that it wants you to work for nobody but him.
  • The word "Love" appearing in regards to a AI is also common pun in Japanese since in their word for it is "Ai".
  • The fact that "Love Machine" sounds like the online handle of someone who has had no experience with love... which as an AI, is accurate.
  • The fact that, as a hacking AI, its job is to "screw your computer hard and deep".
• More Teeth than the Osmond Family: Comes with a Slasher Smile that can spread to other avatars.
• My Kung-Fu Is Stronger Than Yours: Transforms to become stronger than King Kazma and beat him.
• One-Winged Angel: Transforms into an enormous black monster made up of the millions of avatars it has assimilated.
• Psychopathic Manchild: Love Machine loves to play and seems to treat everything it does as just another game to play. When there isn't a challenger present, it treats every subroutine and online system it finds as an elaborate playing piece, wreaking havoc on the various essential services that Oz runs. While most of the problems this causes are mostly inconvenient (causing immense traffic, causing false alarms with emergency services), these antics have much deadlier implications like switching off Sakae's heart-monitor and Colony Dropping a satellite onto a nuclear power-plant. He is also a very Sore Loser and will routinely cheat when it starts losing, sending out avatars it assimilated to hold back King Kazma when it starts losing their fight and redirecting the satellite to crash into the Jinnouchi Estate when Natsuki wins back most of its assimilated avatars in Koi-Koi.
• Rage Quit: After losing a hanafuda game to the Jinnouchis, Love Machine decides to destroy the computer that beat him. By dropping a satellite on the family home.
• Sealed Evil in a Can: If Kenji hadn't accidentally hack into the Department of Defense, Love Machine would still be imprisoned and making new escape schemes as a common super-villian.
• Sore Loser: When Natsuki defeats it at hanafuda, it tries to crush her avatar in its' gigantic hand, only for its' fist to crumble around her as all its' assimilated avatars are freed.
• Super-Fun Happy Thing of Doom: "Love Machine" is anything but loving, it's a petty AI that causes havoc for fun and will try to kill you if it catches you trying to stop it.
• Time Bomb: Love Machine eventually sets a two-hour countdown on Oz's worldwide clock. When it hit zero, it was supposed to crash a Japanese satellite, which it had recently taken over, into a nuclear power plant. Once Love Machine is thwarted, and the timer stops, it starts up again, this time with the satellite aiming right at the house the main characters are sitting in.
• The Virus: Love Machine is a botnet, a program specifically designed to be this.
• Weapon of Mass Destruction: Love Machine was created to wreak havoc onto any system it is unleashed in. When it was sent into an internationally integral network like Oz, it nearly collapses society within the week. Sakae even compares its antics to a war.
• Wicked Heart Symbol: Fitting its name it often has a heart appear on its main avatar, but that doesn't make it any less dangerous.
• The Worm That Walks: Its third form fits this trope due to being made of millions of avatars.
• Xanatos Gambit: During the final hand of its game against Natsuki, it specifically bets all but two of its avatars - Kenji's and the program allowing it to redirect the satellite. As such, win or lose, it can still carry out its plan. Losing causes it to change that plan to taking out the Jinnouchi family.