Oswald Rabbit is one of the main deuteragonists of the Kingdom Hearts Unlimited Saga, taking on part of the role originally played by Riku, the other half being portrayed by Ellidyr.
He is a Keyblade wielder that has the power of Darkness, and is always ready to sacrifice himself to protect his friends. As Mickey's oldest and most dearest friend since childhood, Oswald sees it upon himself to help make their greatest wish come true, but pulls all the wrong moves to do so, succumbing to the darkness in his heart and becoming more arrogant and power-hungry as the journey goes along, ending with his becoming a puppet of the Horned King's malice. It is only by a miracle that Oswald is saved from this terrible fate and begins a long journey to redeem himself for his actions. Finally, when almost all hope is lost for him, he finally embraces the balance of light and darkness that makes up the worlds, becoming a true keyblade master.