Ruby is a sadistic Mystic Code that hates its Creator and likes to tease and annoy it's user/master . Aside from it's sadistic traits, Ruby can be exeptionally loyal to its master; especially Illya
A Kaleidostick, a magical device that enables its user to become a magical girl. Though Ruby initially belongs to Rin, Rin's constant squabbling with Luvia causes Ruby to abandon Rin and contract itself to Illya instead. Ruby is Sapphire's older sister.
Fate/Kaleid Liner Prisma IllyaEdit
As a 'Second Magic' Mystic Code, Ruby can access the Mana Plane and provide it's user/master unlimited Prana. Ruby also has the ability to Include cards.