Nitron

Nitron (ニトロン) is a flying eye-like robot enemy in Mega Man 3 that used to melt hard rocks in energy resource mining areas. They appear in the first section of Gemini Man's stage, both regular and with Doc Robot. When Mega Man is close, it swoops down and drops three fireballs that spout into small flame geysers, a little bit like what Flame Blast does later on in Mega Man 6.

In the Doc Robot version of Gemini Man's stage, Nitrons are yellow and the color of its fire is blue.

Mega Man (Archie Comics)
Nitrons are seen in issue 42 attacking Mega Man in Gemini Man's base. A Nitron also appeared in the variant cover from Mega Man #40.