For Saiouma,
Kokichi is a little spoon, but likes to say he's a "knife"
Since Shuichi likes tea, Kokichi will drink it with him even though he doesn't like it but will put A LOT of sugar in it
When either of them feels sad, sometimes they'll just walk to the others dorm and knock and they just have to give the other a look and they'll cuddle without questions, if the other wants to talk about it they will, but the other won't pressure them at all
Shuichi gets easily jealous, but doesn't like to show it because he doesn't want Kokichi to think he's possesive
I feel like if Shiuchi wants to get Kokichi an engagement ring, he'd want have something to do with a band-aid because of their knife game, but I know he'll probably just be a ring
I like to think that if they ever went to a laser tag place, and Shuichi got shot, Kokichi would just run up and be all dramatic and wouldn't care if he got shot and Shuichi would just be sitting there like: why do I love this dork (Jokingly)