The spinning-top robot master from Mega Man 3 is Top Man. He is one of the game’s eight main robot masters and is designated DWN-021 in the classic Mega Man series.
Top Man was created by Dr. Light and Dr. Wily during their temporary collaboration. His original purpose was to search other planets for Energy Elements needed to power Gamma, the peacekeeping robot being assembled in Mega Man 3. After the robot masters went out of control, Mega Man had to defeat them.
Top Man’s signature weapon is the Top Spin, which makes Mega Man rotate rapidly like a spinning top. The boss is commonly confused with Gyro Man, but Gyro Man is a different robot master from Mega Man 5 whose weapon and stage are based on helicopter flight. Spin Man and Pinwheel Man are not names of robot masters in Mega Man 3.