Adding Gakupo and Gumi onto every single Sekai. A Gakukai headcanon thing? Idk if it's allowed here but here goes nothing.
Also, give your opinion on any headcanon you want.
1. The train in School Sekai goes to a different school, it's the one that Gakupo and Gumi attend and they're a group themselves.
They have their own unit whom they need to take care of but since there's only two of them and at least one of them has to be present when the unit members arrive, Gakupo and Gumi share that time 50/50 sometimes if one of them has other stuff to take care of.
Due to the fact that Gakupo usually needs to be present in his own school at least half the time, Kaito visits as frequently as he could to see Gakupo via the train. He's the only passenger there and he usually brings his guitar with him to have some sessions with Gakupo bc that's a love language to them. L/n have never seen Gakupo and Gumi due to them usually visiting the other school when it's nighttime in real life.
2. Gakupo and Gumi are somewhat fans in Stage Sekai, with Gumi being a huuuggeeee fan of the idol group and Gakupo only being there to support his best friend. He thought idols were a bit boring and whatnot and he only attended concerts and stuff just so Gumi wouldn't go alone. She decided to become an idol herself and he supported her as best he could but one day, on April Fool's, he sent a joke email to Kaito [who is an idol manager as you know] and he explained their entire situation, the fact that his best friend wanted to become an idol and whatnot and to his horror Kaito ACTUALLY RESPONDED TO THE EMAIL AND ASKED FOR MORE INFO SO HE COULD HELP THEM. Gakupo somehow managed to score Gumi an AUDITION and Kaito gave the date of the audition five months away, giving Gumi enough time to practice. Gakupo thought Kaito was a little obnoxious until he set foot for the first time in that studio and was greeted by him [it was at that moment precisely that he realized he's gay] and he just became head over heels for Kaito, who was a bit too oblivious to realize but soon developed feelings for him too. Gumi became an idol and Kaito offered Gakupo a position there too and he slowly climbed his way up into becoming a manager, just like Kaito. They didn't confess themselves, Gakupo got outed by Gumi and Kaito got outed by Miku bc one day, while discussing random stuff, Gumi expresses how she thought it was hilarious that Gakupo's entire demeanor towards idols shifted once he saw Kaito and when Miku asked for further information, she couldn't refuse those puppy eyes. Miku told Kaito that Gakupo liked him and Gumi did the same on her end after Miku told her. They're engaged now [they crushed Minori's dreams since she ships Kaimiku]. MMJ are VERY close with Gakupo and Gumi, ESPECIALLY Gumi.
Gumi idolizing Miku [and being implied to be in love with her] and then becoming a member of her group is reminiscent to Minori and Haruka.
3. In Street Sekai, Gakupo and Gumi live together in an apartment and they come visit the cafe every once in a while because they live far away. Gakupo and Kaito constantly go out together though. Nobody is exactly sure what their relationship is since they never disclosed it but Meiko can tell there's something up between them. VBS have seen Gakupo and Gumi a couple times here and there but aren't particularly close with them.
4. In Wonderland Sekai, Gakupo and Kaito are a married couple. Gakupo was a performer too until he had an accident during performing which left him disabled and so he couldn't get up on the stage anymore and now he's just a prop maker and he's usually in the audience. WxS HAVE spotted him before but he doesn't really... interact with them. WxS mainly interact with Gumi, who also had terrible stage fright and did her best in order to become a musical actress [reminiscent to Nene]
5. In Empty Sekai, Gumi has selective mutism and can only speak with Gakupo. Gakupo on the other hand has insanely childish tendencies and even wears children's socks and has a stuffed rabbit which he carries with him anywhere he goes. Gumi was made from the fact that N25 don't really know how to communicate and struggle with expressing themselves and Gakupo was made from the fact that N25 didn't really have great childhoods and they had a very small inner child which just wanted to... act like a child. Hence why Gakupo is like a little kid.
Gakupo and Kaito's dynamic is complicated here. Kaito hates small talk and whatnot so whenever he's sitting alone, probably by the lake, Gakupo comes over to him and just... sits down next to him without a word.
Gakupo may try to lean on Kaito and fall asleep and Kaito may or may not allow it. Gakupo also sometimes asks Kaito to play with him since Miku is usually playing with Rin or Luka, Len is too shy Meiko doesn't wanna play and Gumi is usually either playing with Miku or sleeping. Kaito just accepts this and the rest of the Vocaloids AND N25 are absolutely baffled as to how KAITO, THE GRUMPY ASS MAN, OF ALL PEOPLE WOULD ACCEPT TO PLAY WITH A STUFFED BUNNY WITH GAKUPO.
Kaito thinks Gakupo is really cute but he's also really calm and collected, making it GENUINELY difficult for Kaito to be ticked off by him since he doesn't talk much and only asks for small stuff occasionally. Meanwhile Gakupo sees Kaito as a "safe" and "protective" person, and due to the fact that his mind is that of a child's, that's exactly who he needs.
It's a really weird relationship and they can't exactly feel romantic love, so this is as close as it gets. But I will say this: For some reason that is still unbeknownst to everyone, one time when Gakupo came up to him and asked him for something, Kaito pulled him by his clothes, kissed him straight on the lips and just let go of him.
Nobody knows why NIIKAI of all people did THAT and nobody knows how and why Gakupo brushed it off as normal.
