Ergo Bayushi is the Second child to Lord Ryu Bayushi. She is the middle child, though not by blood. Ergo was built by Lord Ryu Bayushi as an ultimate weapon in secrecy but to the world made to be Lord Ryu Bayushi's first daughter. From creation she was nothing more than a weapon but over many years of Lord Ryu's dedication to her engineering she has developed prosthetic human emotions and gained attachment to her Father, Brother and Sister. Her known Alis as the "Ruthless Bayushi" comes from her constant intent to kill anything that portrays a threat or disrespect towards her Family and Allie. Ergo was made to protect the Bayushi and Kill any who stands within the way. The only composure of Ergo's that portrays some what of human aspects is her embodiment is of a child's though her mentality and maturity surpasses a wise elder within his sixties, her body remains as a sixteen year old.