So, I was thinking. For Part 7, there could be a character who serves as a callback to Daffy in the same way that alternate you-know-who served as a callback to Dio.
His alias could be: LayTrawly H.O.O
The character could be anyone named Chris, but I'm partial to Christopher Robin.
This is, of course, a reference to that one guy(???) who used to run 4chan.
He won't have the same power as Daffy, but maybe something that takes an aspect of Daffy's power and builds off of that, such as how Daffy needed to mimic an opponent's movements to create a shadow.
His Stand could also wear a cheap looking 「LA CUCARACHA」 helmet or something.
As for his role, he could serve as a foil to whoever the protagonist is.
Instead of being relegated to the end of the story, he could pop up from time to time and serve as some sort of ideal in regards to youth and finding who (You) are.
And instead of being a last ditch effort by the villain, he could be a bit of a wild card.