As different as seasons, yet complimentary. Zero is representing warm seasons, full of life, color and sun. Yet this warmth is protected by Null, who shields him from the cold winter. Zero is an introvert, so when facing the world it can feel cold and need protection: that's where Null's design, his protector's, comes from. Nevertheless, once you can reach his true self, you can feel all of Zero's creativity blooming and filling the world with color and life. Beside them is Fenix, represented as the autumn: a season that feels fresh yet warm, honest and embracing, who as a friend can keep you company and hope for cozy times~