There isn't enough love for the Blue Bomber, especially given that Mega Man Legacy Collection was recently released! ;o (Which is a great way to get into the series, if you don't already own the first six NES titles! ;D)
As for my favourite Robot Master, it'd either have to be Tornado Man or Magnet Man. As for my least favourite Robot Master, apart from the obvious Slash Man.. perhaps.. eh, probably Cut Man actually. He's literally just Mega Man with scissors pasted on his head, and bad posture.
As for game completion, Beaten Megaman 2 and 9, haven't even gotten to the Wily levels in any of the others (Except 3 maybe? ;T) -- although I don't own 7 or 8, so there's that.
Terraria, Minecraft 1.14.4, Monster Hunter World Iceborne, Deep Rock Galactic, Hades