What is a robot master name you're surprised has never been used?

For instance Volt Man (i know the dos game but i mean for reals) or Blaze man. Seems like no brainers and yet they were never used.

Some others:

Storm Man

Bolt Man

Thunder Man

Spike Man

Water Man

Quake Man

I mean in the classic mega man games, not any of the spin offs or the comics etc.