Auto

Auto, known as Rightot (ライトット) in Japan, is a character from the Mega Man classic series. Even though he was not introduced until Mega Man 7, it is clear that he has been with Dr. Light for a long while. He is seen to have a large car, and is the mechanic for Dr. Light. Eddie is almost his pet. He creates items for Mega Man by using Bolts/Screws. In the Japanese version of Mega Man 7, he appears randomly in place of Dr. Light or Roll when Mega Man gets a weapon, making funny comments. 

In Mega Man 8, he appears as an aid in the Rush Jet sections, using a cannon to attack enemies. In Mega Man and Bass he ran a store, where when the player brought him Bolts/Screws, he would make parts for him. In the arcade games, he appears in Mega Man's endings.

In Mega Man 9 he returns to his role of running a shop, assisting Roll. He takes screws as currency. He's also responsible for restoring Rush's Rush Jet upgrade after Mega Man beats five Robot Masters.

Mega Man and Bass CD data
An invention nerd who has created a wide variety of items for Megaman. "Megaman! I am your biggest fan!" Good point: Pure and innocent Bad point: Trouble maker Like: Riddles Dislike: Study 

Trivia

 * Auto makes a small cameo in Volt Catfish's introduction scene in the PlayStation and Mega Man X Collection versions of Mega Man X3.
 * There is a rumor that RT-55J, the robot guarding X's Armor Capsule in Mega Man X (Arm Capsule in Maverick Hunter X) in Sting Chameleon's stage, is Auto in the future. They have similar color schemes and general design.  It is conceivable that Dr. Light redesigned Auto to protect the most important piece of the first Armor that X would need.  This would explain how simple the robot is designed, as it would be ancient technology compared to current Mechaniloids, but it would also explain how difficult the opponent is (Dr. Light is known to be able to create powerful robots).  However, there is no official evidence that RT-55J was built by Dr. Light, or that it is really Auto. It is more likely that the design is a coincidence, or at most a tribute.