Mega Man - A former lab assistant built by Dr. Light, Rock was converted into a fighting robot called Mega Man. With an arm cannon, a weapon-emulation system and a strong sense of justice, he combats Dr. Wilyís ambitions in the name of peace.
Proto Man - The prototype and older brother of Mega Man. At times, Proto Man secretly helps Mega Man master his own abilities, and protects him from impending danger.
Bass - One of Dr. Wilyís greatest creations, Bass was designed to be Mega Manís ultimate rival. His impulsive behavior makes him chase after Mega Man, with the intent of becoming the worldís strongest robot. However, Bass sometimes teams up with him, for his own ends.
Dr. Light - A brilliant scientist that revolutionized the robot industry with his contributions, Dr. Light is Mega Manís own creator. While peaceful, he consistently improves Mega Manís arsenal and abilities, to help him overcome Dr. Wilyís advances.
Roll - A housekeeping robot and Mega Manís little sister, Roll was built out of Dr. Lightís desire to have children of his own. She helps Dr. Light and always prays for the safe return of her sibling.
Rush - Mega Manís all-purpose robot dog companion. Rush is conceived to turn into the right form for any situation, whether itís a spring or a jet. He always gets upgraded, to match up with new challenges that his master faces.
Treble - Being the robot wolf companion of Bass, Treble is fiercely loyal to his master, and will go to any lengths to protect him. Much like Bass is equal to Mega Man, Trebleís abilities are tailored after those of Rush.
Auto - As Dr. Lightís technician, Auto helps around the lab and occasionally makes inventions to help Mega Man. While they may not always work, he is dedicated to doing his job right.
Mute - An enigmatic robot that impersonates Bass. Muteís abilities are similar in every way to those of Mega Man and Bass. He also seems to share some similarities with Bass, yet is more rational and cunning than him. His origin and motives are unknown.
Balance - Muteís sly and mischievous robot fox companion. In addition to sharing Rush and Trebleís abilities, Balance can turn into a spear covered with flames, which his tail is made of. It his rumored that his combat abilities are equal to his masterís.