He had two duties: One, being a character played by the player. Two, when his arcade game in unoccupied, a virus cleaner.

He didn't really have a day in this, since he thought he should atleast maintain peace and cleanliness in his world.

Granger, otherwise known as Agent Z, points his gun at you. He opens his mouth to speak in a child, unfriendly tone. “Speak or I’ll shoot, pesky virus.”