RT-55J

RT-55J is the sub-boss of Sting Chameleon's stage, a big sumo wrestler robot. It guards the capsule where the Body Part (Arm Part in Mega Man Maverick Hunter X) upgrade can be found. In the remake Mega Man Maverick Hunter X and the Rockman X manga, it talks with a robotic voice. It's body is very resistant, being the head its weak point. It punch, jump, and tries to catch the player with its extendable claws.

Trivia

 * RT-55J is similar to Auto, though its head resembles that of a Scrap Robo.
 * In fandom, it's said that RT-55J was created by Dr. Light to protect the capsule, and some say that RT-55J is a upgrade of Auto.