I just thought of an idea about Jusenkyo curses. What if the reason water temperature triggers the change isn't because of the wetness, but because of a reaction to the sudden temperature change.
What I mean is cold water causes skin to shiver and tighten up, and warm water causes muscles to relax, and that causes the curses to activate and revert to people's original form.
The only reason people think water alone is the trigger is that no one has ever had a curse exposed to rapid temperature changes without putting on protective clothing.
Admittedly, that is a far-fetched premise, but no more than any other explination proposed.
Now, with that as a given, what if one of the cursed martial atrists, it could be any one of them, was learning a new technique to toughen their body, like the Iron Skin, where they were able to keep their skin from reacting to, or flinching from, anything happening to it.
With how many fights end with someone getting splashed, imagine everyone's surprise when that person gets wet and nothing happens beyond getting wet.
I think the shock of that would be enough to stop the fight, while all the other cursed individuals ask how that one was cured, and don't believe it when told they don't know.
The rest of the story could be how the one supposedly cured splashes themself again just to prove it to someone else, or they believe themselves cured and so don't try to avoid water around someone who doesn't know about their curse. (Can you say Ryoga and Akane?).
Finally, after instances of changing, and other instances of remaining the same when hit with water, our protaginist finally connects what made the difference in each instance, and trains themself to keep it up all the time, so they don't change unless they want to.
I imagine that, at the end of the story, with all the other cursed people seeing how the instances of change are erratic, they might just write it off as a function of that person's curse, and quit hounding them for their secret, just as the one effected gains full control.
At the end, the one with the technique has to decide if they want to let the others know what had been discovered.
I'm not a writer, so if anyone thinks this is a good idea and wants to pick it up, you have my permission, just acknowledge where you got the idea.
Signed; Marcus Sturm