Other than 'I want Kingdom Hearts' power for myself so that I can destroy stuff and create stuff', what motivations could a new villain have for his/her actions? Within the next saga, it's best if Nomura adds in more plot elements and plot devices so that the next villain isn't just after Kingdom Hearts' power like all the other antagonists. The new villain could wield a new weapon, he may try to exterminate keyblade wielders or even pursue the book of prophecies.
Other than 'I want Kingdom Hearts' power for myself so that I can destroy stuff and create stuff', what motivations could a new villain have for his/her actions? Within the next saga, it's best if Nomura adds in more plot elements and plot devices so that the next villain isn't just after Kingdom Hearts' power like all the other antagonists. The new villain could wield a new weapon, he may try to exterminate keyblade wielders or even pursue the book of prophecies.