The Patronus can take many shapes and forms, but magical creatures are the rarest. Dragons, Phoenixes, and Thestrals are among the rarest magical creatures a person can have as their patronus. All animals signify different aspects of a person's life. It may become their loved ones animagus form, or change to fit their loved ones. Lions, for example, usually come from brash but brave people, while Snakes come from Ambitious but kind people. True love occurs when a person's Patronus changes to match the patronus of their true love.