What role do you think he'll play? Something related to Luffy's Mom? Or to CDs?
There aren't many Hints about his Role, He could still be Irrelevant,
But the problem is that He is still a Card that Oda can Play however He likes, He wasn't Disqualified,
If He appears again, then He might be a Celestial Dragon now, and He was Accepted to Join after what He done,
Which explains what King from Kuma Flashback said, and also why a CD Visited Goa Kingdom,
However, Elbaph Arc gave us another Hint, as it was Introduced similarly to Goa Kingdom (Bar & Kid & Red-Hair Pirates ... etc)
But instead, We go back in Time, with Loki being the Kid & Rocks being Pirate Crew who Visited,
Meaning Goa Kingdom King played the Role of Harald, (He might have been Related to Shanks)
I won't expand on these Parallels, cuz He might be a nobody, and I'm just overanalyzing,
However, if Harald vs Loki is revealed to have happened because Harald tried to pull a Goa Kingdom-Like Incident,
Then We know where King of Goa got the Idea from,
(Also conveniently Harald's Death happened 14 Years ago, and Shanks visited Goa 13 Years ago)
Like Shanks witnesses Elbaph Incident, then suddenly decides to go spend a Year on Goa Kingdom? (After He acquired most important DF?)
And Oda gives both Island same Introduction, and at same time, King of Goa was preparing his Plan that wd please CDs/WG?
There is some Missing Puzzle here,