Delta

"Our microchips are programmed for this. Yours aren't" -Delta

Delta is the leader of Metro City's Anti-Robot Robot Squad, a division of the Metro City Police dedicated to fight crime caused by robots. He was made when robot theft in Metro City has gotten out of control, and was a recurring characters ever since.

He is hinted to be the brother of Epsilon, however, unlike her, he doesn't seem to have Kokoro (he is referred to have programming) and isn't Australian.

Personality
He believes that only he and his squad are qualified to fight robot crime, and quickly shoots down Astro's attempt to help them.