Elec Man is the one of the original robot masters who were turned evil by Dr. Wily. He's one of my favorites for two reasons.
One is that the boss fight was pretty fun. Though using the power he's weak against is too easy. Using more moderate powers makes it more fun as his electric blasts are tough to dodge.
After that you get his thunder beam, my favorite power of the series.
Mainly because (using the "select trick") I was able to defeat this boss before facing Dr. Wily. Very powerful blasts. Too bad they removed the select trick from the Anniversary Collection on PS2, GC, and Xbox.