Name: Yukito Frost Position: The true Guardian of Winter; royalty, but treated as a servant Origin: Kingdom of Winter Speech: Taciturn, short sentences Personality: Calm, self-sacrificing, suppresses emotions but kind at heart Features: True winter crest on his left eye (usually covered by an eyepatch); grew up unloved with low self-esteem; slightly softer only toward spirits; Richelle's younger brother.

Name: Haruaki Sakuraba Position: Guardian of Spring, Imperial family Origin: Kingdom of Spring Speech: Gentle and polite Personality: Gentle, highly observant, the type to see through to the essence of things Features: Cherry blossom crest on his right eye; likely to be the first to notice Yukito's true identity; dislikes conflict but acts calmly when necessary.

Name: Leon Solaris Position: Guardian of Summer, Prince Origin: Kingdom of Summer Speech: Boisterous, frank Personality: Hot-blooded, intuitive, cares for his comrades Features: Flame crest on his left eye; hates lies and injustice; the type to be the first to take an interest in Yukito.

Name: Erna Louvel Position: Guardian of Autumn, Princess Origin: Kingdom of Autumn Speech: Quiet and composed Personality: Intellectual, calm, slightly mysterious Features: Autumn leaf crest on her right eye; rarely shows emotion; has a strong interest in the "truth."

Name: Richelle Frost Position: The fake Guardian of Winter, Princess Origin: Kingdom of Winter Speech: Elegant and soft, but with a sting Personality: Prideful, strong desire for validation, selfish Features: Fakes the winter crest with colored contacts; raised doted upon by the King; feels superior to and looks down on Yukito; Yukito's older sister.

Spirit of Spring, female, serving Haruaki.

Spirit of Summer, male, serving Leon.

Spirit of Autumn, female, serving Erna.