Who is Neysa from Blue Adept and what is their importance?

Neysa is a unicorn who serves as Stile's mount in Phaze. She is also his oath-friend and protects him from danger during his adventures. She postpones damhood in order to protect Stile, which is the reason Stile must answer the Herd Stallion's challenge at the Unolympics. Neysa also has two alternate forms, a firefly and a small, pretty human girl.