Proto Man

Blues, or Proto Man, was the first robot built by Dr. Light and Dr. Wily, and is thus the older brother of Mega Man and Roll. His design is similar to Mega Man's, but he has a shield in addition to his mega buster. He is good, and helps Mega Man out on occasion, but prefers to wander the earth alone. His appearance is heralded by a short tune on a whistle.

Proto Man debuted in Mega Man 3 under the alias of Break Man. He apparently worked for Dr. Wily and fought Mega Man several times throughout the game. However, he saved Mega Man from the exploding fortress at the end of the game, revealing his true alliance. He continued to work as a spy in Wily's ranks until the end of Mega Man 4, when Wily found out about his betrayal. Proto Man appeared to be the mastermind behind Dr. Light's kidnapping in Mega Man 5, but it turned out to be an imposter called Dark Man.