Esther is a character from Ni no Kuni: Wrath of the White Witch.
She comes from Al Mamoon and is the daughter of the Great Sage, Rashaad. She had a piece of her heart stolen by Shadar, which requires some help from Oliver. It turns out that her soul mate (real life counterpart) is a girl named Myrtle, who is "sick." Oliver helps her out by defeating the Nightmare inhabiting her father, Rusty, and then mending his broken heart. This leads to Myrtle being cured and Oliver getting some extra courage from her, which they used to mend Esther's broken heart, curing her.
