Oliver is the main character of Ni no Kuni: Wrath of the White Witch and Shikkoku no Madoushi.
He is a young boy born and raised in the town of Motorville (Hotroit in the Japanese version). One day, while testing out a vehicle that was built by his friend, Philip, he ends up landing in a river. His mother was searching for him and upon finding him in the water, swims out to rescue him. She ends up getting sick and eventually passes away, putting Oliver in a depressed and grieving mood. While clutching onto the doll made for him by his mother, he starts crying and the tears make the doll come alive.
He calls himself Drippy and is a fairy from another world. He mentions that it's possible to save Oliver's mother by going to his world, thus starting Oliver's journey as a wizard in Ni no Kuni. The inhabitants of Drippy's world call Oliver the Pure-Hearted One, who will free their world of the darkness.
