Princess Icy is a witch who has been described as having a "heart of ice" and the eldest member of the Trix (a trio of witches) where she is the leader who wishes to rule the universe. She is also a former student of Cloud Tower as she and her sisters (later retconned in Season 8 to being close friends), Darcy and Stormy, were expelled in the episode "Cold Spell". In "Dyamond on Ice", it is revealed that Icy is the princess of the planet Dyamond and she has a younger sister named Sapphire.