crystal is a ride-or-die coca-cola girlie. niko is partial to pepsi. charles always liked dr pepper best. edwin likes coca-cola but when he finds out they took out the cocaine he is like literally what even is the point. this effectively ends the argument
crystal uses those little blue star pimple patches and whenever she does, niko will give it a little kiss. it's all very cute. except charles and edwin don't realize what or why this is, so they assume it's some human tradition, and so they start doing it too
niko has a bedazzeler and she uses it for evil
edwin actually is extremely good at handling his drink. he could drink crystal under a table. crystal is extremely mad when she discovers this the hard way (they play 'never have i ever' and not only is edwin constantly drinking because he has been around the block more times than once, but he's barely even tipsy)
crystal has actually never checked her email ever. she has 15,079 emails and counting. edwin is very distressed by this
charles had a pirate phase as a kid. crystal had a dinosaur phase. niko had a horse phase. edwin had a train phase. this isn't even a headcanon i'm objectively correct
crystal has broken her phone like 15 times
when crystal finds out niko's never kissed anyone, she offers to be the first - not even necessarily in a romantic way, just like "you're my friend and i'm happy to share this experience"
crystal is extremely anti romeo & juliet. this leads to many fights between her and charles
crystal has seen chicago 13 times. it's the only musical she's ever seen and at this point she can't see any others just for the bit of having seen chicago 13 times