I want Kokichi and Angie to have a very low-boundaries friendship.
Give me "Kokichi's hoarding gets so bad that there's no room for him to sleep in his bed, so he casually shares Angie's".
Someone knocks on Kokichi's door at night or early in the morning, trying to have a private conversation with him, and it becomes a whole thing, like, "I knocked on your door last night! Where were you!"
He replies with a super frictionless, "I slept with Angie," or he draws out the mystery, just to infuriate people, until Angie comes over and remarks, "Kokichi left his hair gel on Angie's bathroom sink."
"Well, yeah. Where else am I supposed to leave it?"
"Angie keeps hair products in the medicine cabinet~✨."
(Then maybe Miu makes some dig about Angie using any hair products at all, and Kokichi shoots back with a characteristically extreme putdown.)
At any given moment, one of them has their head on the other one's shoulder. And there's a little move they both do where, if they need the other one to get off them, they'll just slightly shrug that shoulder, to signal "Move over." It's usually Kokichi who does this, since he's more likely to want to suddenly stand up or run or gesture or whatever else, but Angie does it, too, especially if Kokichi is resting on her while she's making art and she needs to adjust her position or range of motion.
Also, maybe Angie has some kind of bad habit like nail biting or lip biting, so Kokichi can just kinda throw things at her when she starts doing it. Like, she gets distracted and starts chewing her lips while painting a landscape, and Kokichi points and exclaims, "Hey! No biting!" He picks up a drop cloth and throws it at her, then an art sponge, etc. Just absolutely pelting her for a few seconds.
Angie pinches him or pokes him or something whenever he curses too much.
Miu keeps voicing a highly specific theory that Kokichi and Angie have seen each other naked, and no one believes her.
Kokichi's a "We're on our period," type of friend. Like, "No can-do. We're on our period this week."
Someone invites Angie to go swimming, and Angie takes a moment to think about it, and Kokichi just silently passes her a tampon he was keeping just in case.
Maybe one day everyone's mad at Kokichi and they bang on Angie's door like, "Angie, send him out. We need to have a chat." And Angie harbors him, not letting the others pressure her.
