You first catch a glimpse of Father Tres in episode one where he appears to lack emotion. That's logical, because Father Tres is a machine. He is field operative HC III X or code name, Gunslinger. As any programmed machine, Father Tres carries out his orders to the letter. Normally, the orders require him to be heavily armed and firing round after round from his powerful guns. There's no need to worry about his destruction, because this android has his own self recovery system.

Father Tres is considered one of the most vital figures within AX.