Hopefully Zoro. Just look at how big of a boost trading Shusui for Enma gave to Zoro
OT: At the beginning of the arc I thought that the Nidai was a red herring and that Zoro would get another sword to replace the Sandai. I was partly right because Zoro got a new sword (which is not the Nidai) but to replace Shusui.
Now I’m torn with two possibilities:
-At the end of the arc, Zoro discover that turning a blade black allow you to unlock its true power. Therefore realizing that until now he was not using Shusui real power he goes to Ryuma grave and takes it back
or
-At the end of the arc Hitetsu, flabbergasted by Zoro turning Enma black, offer to reforge the Sandai with the Nidai to create a brand new sword
I love Shusui so I still want Zoro to have it but the idea that Zoro got a sword made specifically for him is very cool too

