Here's an idea for a heaven's door fight that makes use of Surface, Hazamada's ability, considering he basically just falls down and screams for most of his portion.

Here's how it could play out:

Hazamada and Koichi are attacked by Heaven's Door. Rohan explores both of their pages, then goes to write on Koichi's. However, Hazamada takes control of Rohan using Surface, and writes something granting strength to Koichi that helps him defeat Rohan.

However, I've noticed some holes within this fight that would have to be resolved.

-Hazamada's Surface was destroyed, so he can't use it during the Rohan fight.

-Unless Rohan was careless, he would've written on Hazamada rendering himself incapable to attack Rohan with Surface, provided he actually had the stand.

Regardless, I felt like this was something worth sharing, as I've had the idea for a long time but have never actually done much with it. I may need to forgive Hazamada not having Surface, but I'm not sure how Rohan won't put a lock on Surface.