(Eastern): Eastern dragons are more serpentine looking and often whiskered. They specifically symbolize the power of the ruler, masculinity, yang, prosperity, rain, wisdom and hidden secrets.
(Western): Western dragons are more reptilian, more massive and often have large, almost bat like, wings. They specifically symbolize fire, confrontation, danger and seclusion.
Griffon: Gryphons are guardians. They symbolize spiritual enlightenment, the seasons, the relationship between psychic energy aand cosmic forces. They are connected to the Sun, the Sky and the Earth as well as Nemesis and Apollo.
Pegasus: Pegasi symbolize inspiration, poetry, grace, freedom from earthly cares, astral travel, transformation of evil to good, fame and eloquence. They are connected to Demeter and Osiris.
Phoenix: The Phoenix is a symbol of resurrection, rebirth, spiritual growth, strength and energy for life trials, fire and royalty. It is a a lunar/solar symbol and is connected to Osiris, Ra and Circe.
Unicorn: Unicorns are symbols of innocence, good will, fame, prosperity, healing, gentleness, purity of mind, personal power, naivety, joy, life, nature and freedom. They are connected to Artemis, Diana and moon goddesses in general.
(Reproduced from: http://wicca.com/celtic/wyldkat/wkmyth.html)