Hehehehe I couldnt resist lol.
Yamato having her own crew or at least her own scabbards going like the cover story implies atm would be really cool.
I have my headcanon that eventually we're gonna see her running on the ocean using her DF to create frozen platforms as she runs across it or even doing an ice slide Frozone style (Oh wait that would fit Kuzan more lmao) and she would be running towards the Sunny and maybe grabbing onto it by the anchor chain like Oden did.
Luffy would then test her loyalty to the crew and at the same time see if Wano can truly defend itself without her, by making her do a similar test to Oden before he lets her board and join the crew officially. But given her DF too, idk if its gonna weaken her too much with exposure to the seawater? So maybe she doesn't do the anchor thing but hops on board from the ocean or even runs into Elbaf or whichever island and does some super cool dramatic entrance?
Bonus points if she does this lmao: