He bounces between looking almost exactly like Riku and then a younger, silver haired Noctis.
It's not the most inspired or distinctive design, aside from the heterochromia iridis.
He's almost a J-RPG cliche in this day and age, and it's thanks to the fact he keeps mimicing one of the most iconic, unrealized titles from Square-Enix. I don't see it as a good fit for this guy at all. I can't take him or his attitude seriously.
And if anyone truly believes Versus XIII's original intended plot is going to somehow be realized in any meaningful way through Kingdom Hearts/Verum Rex, then I direct you to the censorship of Eraqus' death, Aqua's choke at the hands of Terra-nort, the undead pirates in Port Royal, and the source material of Disney in general.
At best this will be a hack-job Versus XIII, where when we finally get to play the Insomnia Invasion scenario, it'll be Captain Hook invading Yozora's castle with his Pirate Ship, sending a bunch of heartless pirates and Gigas toys to riot in the streets while Not!Ignis and Not!Ardyn help you out.
There won't be a city where Yozora and his mafia-esque family rule with the protection of a Goddess of Death, and Yozora gets his powers from witnessing the light of souls crossing over to the afterlife. And Yozora won't have to deal with rival families trying to rob him and his family of their crystal through assassination and murder, while simultaneously having to kill rival families to protect his own.
That's not Kingdom Hearts. At all. Looking at DDD, even the mature themes from The World Ends with You were toned down.
So this belief of Versus XIII resurrecting in Kingdom Hearts is so baffling to me. It's nothing but aesthetics.