I made this reference almost as soon as this character appeared. I hope to make him a redraw.
Keru worked as a personal bodyguard for the bearer of the Purity Heart. He volunteered for this in the first place to prove himself in the council. And also to establish a connection with the Omega(13) family.
He also had a friendly relationship with the protected lady Omega (13). In the future, Keru-Keru will apply to the council for the place of the free Sigma number to become part of the council of old families.