Not even. All Kingdom Hearts characters have the uncanny ability to survive falling from unreasonably tall heights. 

 

Unless the plot/movie of origin demands it, like Frollo or Scar. 

 

But even then they'll just be brought back by the plot anyway, like Hades and Ursula. So really, every Kingdom Hearts character is immortal, lol! 

Not even. All Kingdom Hearts characters have the uncanny ability to survive falling from unreasonably tall heights. 

 

Unless the plot/movie of origin demands it, like Frollo or Scar. 

 

But even then they'll just be brought back by the plot anyway, like Hades and Ursula. So really, every Kingdom Hearts character is immortal, lol! 

 

YES! How many times do I have to tell people?! If I can use Sora to jump off a high building or a large cliff back down to ground level, getting at least 10 seconds of air time, and not break my character's ankles, then logic has failed you!

Nope you missed it! Master Xehanort would return again!

There is no fall damage in KH, so nothing would happen. Even so, he could just teleport.

It's a joke,don't take it too seriously on the logic we know...