hm i did think of a cost support that increases w cost regeneration, and i guess we did get s kisaki (tho i was thinking more of a s kisaki and ui/seia hybrid that cuts down some skill cost, not by half, but, like a third or 1 and on top of that increases cost regen by a small amout. but whatever)
and now. what if we get a stability support somewhat soon? i doubt that it will be the only thing that she'll offer (look at base nodoka and her hyperfocus on accuracy...). my initial thought was crit/cdmg/atk/any dmg. and then i remembered that ba has a defense penetration stat (i don't remember the exact name but that's what ny mutsuki gets at ue40). and then i remembered that the only raid where stability is a major factor is binah which directly reduces it. so. imagine a support like that. +n stability and +m def penetration. i can already see her having red armor and bad indoors mood.
a thematic vector that tickles my fancy is a support that makes sure your team deals damage. yes, in a bigger number way, sure, but mostly in minimizing smaller numbers and outright misses way. probably, like, crit, accuracy and stability on ex and on normal she reduces evasion (and crit resistance if they're feeling more featurecreepy) of an enemy.
...it all comes back to mika, huh? crit doesn't give her much, but another raid that somewhat demands good stability rolls and absolutely wants no misses is chesed. well, mika speedruns on chesed. hmmmmmmm. oh, cherino! accuracy buffs for cherino! on the same raid! make this stability/accuracy/crit support a red winter so she benefits the team wuth cherino's passive!
this "if you hit then you do hit" support won't be a team 1 or team 2 unit, though (a case can be made for chesed like i said w mika and cherino, but if one wants to pursue comfier runs, then sure)
actually, who has stability self-buffs? dhina has it somewhere iirc? and was it hibiki? i think it was hibiki, yeah.