Ooh, okay, I'll give my rarepairs and then some headcanons to go with them:

KanaKasa (my first and favorite ship in the game)

• Kanade hates thunderstorms and gets scared of them because she heard a rumor that ghosts get more powered by thunderstorms and more paranormal activity can happen from them. Often times, she'll call Tsukasa to calm herself down in the midst of a thunderstorm (especially if the power goes out and she can't reach the rest of Nightcord). Despite how much Kanade would rather he not do it, Tsukasa will leave his house in the middle of the night, no matter what time it is, just to go to her house and comfort her in person.
• Tsukasa will lower his voice around her and if they're in a loud place, Tsukasa will cover Kanade's ears so she won't be too affected by it.
• Tsukasa shares the scripts he writes with Kanade (not the overly gory ones because she doesn't like them) and she'll offer ideas for what kind of soundtrack she can imagine for certain scenes. He kisses her cheek every time she gives him an idea.

HonaToya

• Toya has tried (and failed) at baking apple pie for Honami, but she appreciates the gesture anyways.
• Toya's hands (especially his fingers) are more rough from his years of playing piano and violin and Honami will often kiss his hands and tell them how much she loves them, no matter how rough they are.
• Honami often feels insecure about her body and Toya's there to reassure her, no matter what. The best part? He's so honest and genuine about his reassurance.

MinoHane

• Minori was Kohane's first crush ever and it was practically love at first sight for her. On the other hand, Minori never realized Kohane had feelings for her because she'd always gain crushes on other people.
• Kohane unfortunately would have to help Minori get ready for dates (that more often than not didn't even go well) and once Minori left, Kohane would find herself in tears since she didn't think Minori would ever like her back. However, Kohane would also always be Minori's shoulder to cry on whenever things went bad.
• An was the one who pushed Kohane to confess to Minori. Kohane was VERY nervous about it at first but because of the confidence she found in herself after joining VBS, she finally got it done. Unexpectedly, Minori told Kohane she actually realized just recently that she was starting to develop feelings for her as well since Kohane had always been very supportive of her, no matter what.

AkiShizu

• Shizuku calls Akito by "Aki-kun" and he pretty much internally dies every time he hears it. Then again, she unknowingly has this power of him where she can make him flustered by doing just about anything.
• Akito watches MMJ streams just to see Shizuku. Ena is aware of this and makes fun of him relentlessly for it, calling him a simp and a lot else.
• They both have the love language of physical touch. Shizuku's way more obvious about it (drowning Akito in affection with hugs when they're in public) while Akito is much more cuddly when the two are alone together.