megaman: Mega Man is the main hero of all the Mega Man games, hence the name Mega Man. He is about 4 feet tall and very blue. He was created by Dr. Light as a tool using robot named Rock but when Dr. Light's assistant, Dr. Wily, went crazy and stole the other robots and tried to take over the world. Dr. Light turned Rock into the fighting robot Mega Man.
Protoman: Protoman is another of Dr. Light's creations, he is Mega Man's Prototype/Brother. However many years back when Protoman and Dr. Light were working in the lab an accident happened and Protoman was lost for a very long time. Later he came back and was tricked by Wily and used against Mega Man (Mega Man 3) but he eventually realized Dr. Wily was bad and helps you now in the fight.