Who is A. Bettik from Endymion and what is their importance?

A. Bettik is an android. Biomanufactured, he has blue skin, but he has not been programmed like a machine. Bettik was created to be a servant to humans, and he was engineered to be stronger than humans. In addition to his strength, he requires little sleep, can hold his breath for extended periods of time, and he can withstand extreme temperatures.