I feel like Zoro will get another change from the title "King Of Hell" to perhaps something else, it's like he became that King only for the benefit for someone else (Luffy) to become the greatest swordsman... But what would he be whenever luffy doesn't need him to be that?
Like I don't know actually much about it since I haven't fully consumed Wano, but
when I read the texts, it does sound like something he doesn't care in being, losing himself for the sole purpose of helping Luffy, which isn't something Luffy would like and perhaps might be the cause for Zoro changing to something else?
King Of Hell is from enma, then what King would be Wado Ichimonji?

(Enma is dark purple and Ichimonji is pure white, something Nika also takes the shape off)
Might be something Zoro changes whenever he fights Mihawk tho