Doc Wily must really be hard up for ideas when he's looking at things on his desk or in his bedroom for something to base a master robot on. He should just make another fire-based robot, ice-based robot, electricity-based robot, water-based robot, animal-based robot, weapon-based robot, sky-based robot, blade-based robot, earth-based robot, plant-based robot, boomerang-based robot, etc.
Or maybe he should spend his time making sure that whatever ability Mega Man copies from a master robot will not severely damage one of his other robots. Or make it so that Mega Man cannot copy his robots' abilities. Or just make an army of all the same master robots, like 8 Quick Mans (Quick Men). Or put all of his robots in the same room. Or make a lot more than 8 robot masters. Or kidnap Dr. Light and lead Mega Man into a small room that has no way out and drops him into some spikes. Or mail an EMP generator to Mega Man. Or cut out the middleman and just nuke Monsteropolis. Or get a different hobby.
I'm Cynical Spoil-Sport Man.