from what i know of kaine they have both been through Shit but came out the other side insisting they were Fine And Badass but half the shit they do is because of hang-ups
i like that their clothes also are very related to their issues. saeri's brother would break her glasses all the time or steal and hide them so she got used to getting dressed without them so she had all of her clothes in very bold colors so she could know what she was putting on.
oh saeri does too. she just acts like she thinks she's hot shit. really, she's a self-loathing perfectionist with abandonment issues who thinks her only value is what she can give/do for others.
this is why i think they would either hate each other (because of performative personalities) or get along really well because they kind of get that life is shit and people are shitty but fuck them they're still here
although if I were it would probably be with Tetsuo, so