Riannon

リアンノン

The main heroine, she released Arawn from his slumber. She takes an instant liking to Arawn after he saves her, and decides to marry him. Riannon's true (magic) name is Primula; she is the direct descendant of the elf king Pwyll, mixed with human genes since she is only partially elf. She, like her brother, thinks simply, which sometimes leads Arawn to call them 'foolish brother and sister' due to some foolish things they do.
Riannon is adept at magic, particularly healing spells. Her naturally sunny personality, as well as her skill in the kitchen, endear her to friend and foe alike. The red sash she wears can only be given to the man she is to marry, which is also the mark of the Gael clan chief. She gives this sash to Arawn as thanks for saving her from mind-control, and to keep her brother Aurthur from attacking him, though also because she had romantic feelings for him from the moment she saw him.
The first of Arawn's three wives in the anime, and the first of five in the PC game, Riannon doesn't seem to mind Arawn having multiple wives, taking such things in stride.