Rithy is Pyrus' wife. She comes down at the end of Stardust to see Tristan Thorne's coronation. She is not a magical star like her husband Pyrus, but she can shine brightly. She killed Prince Sextus because he was mocking her.
Rithy was known as 'The Winter Star'. She met and married Pyrus when she was 18.
She was like Pyrus, she loved to see love and adventres.