*Actually 'sexless', without genital organs - chooses to appear female* *Age of human appearance*
:: Background Story ::
(Spoiler Alert)
Chirin is second of Luna's four guardians to appear in the story, Chirin appears in her animal form, 'called into existence' by Luna's desperate cries for help when Tyrin is taken away by the guards for stealing. After helping Luna with Tyrin's escape by sneaking the cell keys to her, Luna remembers the 'cotton-coloured squirrel with a heart on its forehead' when they meet again later in the city. Although at first Chirin was hesitant because she was confused of her identity, her encounter with Angelira led her to accepting her fate and joining the group. Chirin's anthro form is enabled on the night of the grand celebration, when she finally couldn't stand to watch Luna helpless as she was with dressing herself up.
Later in the story, the guardians' origins are revealed: where they came from, how they came to be, and why they were created. However, until then - the guardians do not know anything themselves nor remember a past before meeting Luna. The only thing they hold onto is knowing deep in their hearts that that exist solely for Luna; her happiness and safety.