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These are the modern-day characters from KaibaCorp, primary antagonists to the youkai.
The KaibaCorporation is an elite youkai-hunting business, a multi-billion-dollar company and primary military contractor in non-human suppression to the Japanese government. It's also been family run for almost 100 years, and they maintain a responsible and benevolent public image.
- Badass Family: KaibaCorp is a family business, and every member of the family is an accomplished youkai hunter.
- Emancipated Child: Averted in that they’re aged up from their Yu-Gi-Oh! canon; Seto and Seth are 20 and Mokuba 15, and their father has only been dead for a year.
- Family Business: They’ve been youkai-hunters since the 1920s when the family business was founded by Eiji.
- Famous Ancestor: Saitou
- Subverted: They’re actually descended from Eiji, Saitou’s adopted son, so there’s no actual blood relation.
- Although that doesn’t stop their reverence from converting him into an ancestor kami.
- Subverted: They’re actually descended from Eiji, Saitou’s adopted son, so there’s no actual blood relation.
- Private Military Contractors: This is KaibaCorp’s role, the largest independent contractor in anti-youkai development and action for the Japanese government.
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Kaiba Seto
Kaiba Seto
Original: Yu-Gi-Oh!
Seto is the eldest Kaiba sibling and the CEO and primary public face of KaibaCorp. He is a true believer in the fight against youkai, believing that coexistence isn't possible or desirable.
- The Ageless: Thanks to Bakura’s magic.
- Aloof Big Brother: Seto is presented as a rather harsh and distant eldest son, even though he’s Seth’s twin and so barely older. Probably has to do with their jerkass dad.
- Armored Closet Gay: So much. Bakura manages to get through. Eventually.
- And I Must Scream: He’s trapped in his own mind, in an illusion of Hell, for five months, his body in a coma, unable to get back.
- Benevolent Boss: He’s not kind, per se, but he’s not cruel, and he has the best interests of his employees (and all humans) at heart.
- Brains and Bondage: He’s a submissive of the type with a high-pressure career and very dominant public persona.
- Claimed by the Supernatural: Bakura gives him a tattoo mark to claim him as his mate.
- Touched by Vorlons: Bakura's mark gives him apparently eternal youth.
- Denying the Dead Parent's Sins: Seto doesn’t want to accept that Saitou is their revered Fujita Gorou. Eiji painted him in a very flattering light. He also seems to think that their father had some sort of redeeming qualities.
- Did You Just Flip Off Cthulhu?: Even when he's dealing with kami (that is, literal gods) he remains haughty, insulting, imperious, and annoyed at the inconvenience. It doesn't always end well.
- The Dutiful Son: Learns as he was supposed to and follows in his father's business and philosophical footsteps.
- Embarrassing Nickname: Kenshin calls Seto “Seto-chan”.
- Evil Twin: Seth - he’s always had lax morals and been selfish and rebellious and eventually betrays not only the family and company, but humanity itself.
- Follow in My Footsteps: Their father’s intentions for Seto were always that he would take over as head of KaibaCorp.
- Foolish Sibling, Responsible Sibling: They aren’t different enough to be Polar Opposite Twins, but Seto is responsible and all but humorless while Seth - accomplished in his own right but not averse to putting work aside - is renowned mostly for his ability to sleep with guys.
- Gender Bender: Rune curses him with water-triggered genderbending in 2015.
- First Law of Gender Bending: Defied. It seems to have been intended to be permanent, but Bakura fixes the curses so it’s a lot more manageable, and Seto doesn’t have to stay a girl for any extended amount of time.
- Second Law of Gender-Bending: Averted. When he’s cursed to genderbend, he does not enjoy it. He comes to accept it for reasons primarily to do with Bakura and sex, but he will still choose to be male whenever possible and gets irritated with Bakura for changing him. Seems to prove that even though he’s gay - he remains interested in men regardless - that does not in any way equal femininity.
- Third Law of Gender-Bending: Invoked and Downplayed - Bakura wants she-Seto to dress and act more feminine, but Seto refuses in any way more material than getting clothes that actually fit (as her body type is significantly different).
- The Mind Is a Plaything of the Body: Averted. When he is cursed into female shape, he is very stubborn about being the same person, with the same sexuality, despite Bakura’s attempts to get him to loosen up.
- Shapeshifting Squick: Is initially repulsed by seeing Bakura change shape to seduce him, and when his Gender Bender curse kicks in he is also repulsed at the idea of Bakura doing anything with him in female form. He gets better.
- Hegemonic Empire: Seto and KC during and after the apocalypse.
- Honest Corporate Executive: KaibaCorp isn't into anything shady or suspicious, and he has no ulterior motives - the company's mission is his true goal, and everyone knows it.
- I Have No Brother: Seto disowns, imprisons, and tries to kill Seth after he’s turned by Aoshi.
- Cain and Abel: In which he plays Cain. He can’t rest while youkai-Seth is still alive.
- Knight Templar: Seto firmly believes all youkai are a menace and they must be contained or killed.
- Literal-Minded: Develops this trait during the apocalypse as his form of insanity.
- Mission Control: He does most of his leading from his office computer, taking in information and making decisions, sometimes on the fly.
- The Strategist: His strength lies in making up plans, and then plans to fix those plans.
- Teen Genius: Moreso than either of his brothers because he received more training.
- Utopia Justifies the Means: Seto, and KC in general.
Kaiba Seth
Kaiba Seth
Original: Yu-Gi-Oh!
Seto's slightly-younger twin, who does more behind-the-scenes work for KaibaCorp, actually interacting with youkai - either in actively hunting them, or in working with cooperatives.
- Affectionate Nickname: Seth calls Mokuba “Mokie”.
- Mokuba calls him “Niichan”.
- The Ageless: Perpetually 20ish after being turned by Aoshi.
- Always Someone Better: Seto. He downplays it and acts like he doesn’t notice or care.
- Animal Motifs: Snake, by
Word of God. - Animated Tattoo: A snake which he got from Aoshi’s tattoo biting him.
- Big Brother Mentor: Literally, to Mokuba.
- Black Eyes of Crazy: Seth’s vampire eyes are “metallic blue” - with black sclerae.
- Brains and Bondage: He showed some kinky sides to start with, but it gets cranked up after he gets with Atem.
- Evil Twin: Seto - he’s cold, distant, and increasingly focused on the genocide of the youkai.
- Foolish Sibling, Responsible Sibling: They aren’t different enough to be Polar Opposite Twins, but Seto is responsible and all but humorless while Seth - accomplished in his own right but not averse to putting work aside - is renowned mostly for his ability to sleep with guys.
- Honest Corporate Executive: He's never anything less than upfront and genuine with KaibaCorp until he usurps Seto's place - at which point he's impersonating an Honest Corporate Exeutive, so it hardly matters.
- Immortal Life Is Cheap: Seth is killed temporarily so that Bakura claiming he killed him won’t technically be a lie.
- Impersonating the Evil Twin: Seth assumes Seto’s identity and runs KaibaCorp for a year.
- Pet the Dog: In his first scene, where he’s discussing his work capturing youkai, he gives money to a busker.
- Psycho Supporter: To Seto. He’s willing to make shady deals with youkai that Seto never would and see in shades of grey. He’s also willing to take unconventional methods to study their subjects.
- Teen Genius: Although he received less training than his twin, he is shown to be extremely adept at his high-pressure corporate job, as well as his scientific hobbies.
- The Twink: Minus some of the aesthetic.
- Partially a Take That! to their father, leading to a cycle of un-favoritism and acting out.
- The Unfavorite: To their father. Some of which is his own doing.
- Some Middle Child Syndrome to go with it. Seto’s the heir, Mokuba’s the baby. On the other hand, that does mean that Seth gets away with more.
- Also seems to be The Unfavorite to Aoshi, because of who he is. He was turned as revenge on the Kaibas rather than because Aoshi wanted him, and he doesn’t receive much training, to start with.
- Woobie, Destroyer of Worlds: Seth gets a lot of shit, particularly from Seto. And then the apocalypse happens and he goes pulling Atem’s strings…
Kaiba Mokuba
Kaiba Mokuba
Original: Yu-Gi-Oh!
Youngest son of the Kaiba clan, he loves and looks up to both Seto and Seth. He goes through conflict between his training as a youkai hunter and the youkai he meets.
- Affectionate Nickname: Seth calls Mokuba “Mokie”.
- Mokuba calls the twins “Niisama” and “Niichan”.
- Big Brother Mentor: Seth, literally.
- Claimed by the Supernatural: Accidentally bound to Seth, who tries very hard not to give in to the urge to feed on him.
- It Was a Gift / Take Up My Sword: Saitou passes Ookami no Hantei to him when he's no longer human enough to use it.
- Overshadowed by Awesome: Mokuba doesn't live up to his true potential because he’s been trained to think that Seto as the eldest should be the best.
- Put on a Bus: Just before the apocalypse for his own safety.
- Magical Land: Where the bus goes. The Earth Kami’s realm, where he’s spending the apocalypse.
- The Bus Came Back: Theoretically after the wild earth magic settles out.
- Teen Genius: Not as obvious as Seto or Seth, but Mokuba is every bit as intelligent.
