Ruby Hoshikawa is a supporting character in the anime series Kaitou Saint Tail. She is Seira Mimori's pet dove and plays a significant role in aiding Saint Tail during her heists. Ruby often delivers messages between Saint Tail and Seira, acting as a messenger and lookout. Her loyalty and intelligence make her an indispensable ally, and her presence adds a touch of charm and whimsy to the series, highlighting the magical and mysterious atmosphere surrounding Saint Tail's adventures.