Well, to answer your question. You do DUST off a skull. Y'know, like a fossil? (Dust Man -> Skull Man)



Another way to remember the weaknesses with these guys Is by going literal. Like--



Using the Brightness of a light to reveal a Pharaohs tomb (Bright Man -> Pharaoh Man)



Drilling into a Toad would just be disgusting (Drill Man -> Toad Man)



Skulls of fossils can sometimes be too heavy for deep sea Divers (Skull Man -> Dive Man)



The Pharaohs powerful fire blast melts metal Rings, or how the Ruler humiliates the Servant/Jester (Pharaoh Man -> Ring Man)



Large objects, like Rings, can clog things like vacuum Dusters (Ring Man -> Dust Man)



The hide of a Dive sub might be too strong for a Drill, or how water can rust metal (Dive Man -> Drill Man)



& the heavy storms that Toad Man creates can cause a blackout, causing us to loose something Bright (Toad Man -> Bright Man)





And with Mega Man 11, I remember the weaknesses by using Scientific Terms. Because--



Blocks have high Acidity resistance (Block Man -> Acid Man)



Electricity has high conductivity with ice, or frozen WATER (Fuse Man -> Tundra Man)



Detonating Blasts can/will weaken or destroy the stability of a Block/Brick building (Blast Man -> Block Man)



The strength of Acid can melt through a metal machines hide (Acid Man -> Pile Man (Japan)/Impact Man (USA))



Sub-Zero temps + freezing winds can extinguish a raging flame (Tundra Man -> Torch Man)



Fire can cause systems to overheat and explode, and can pre-detonate explosives (Torch Man -> Blast Man)



Sharp objects cause balloons, balls, and Bouncy objects to pop (Pile Man (Japan)/Impact Man (USA) -> Rubber Man (Japan)/Bounce Man (USA))



& Rubber insulates electrical currents (Rubber Man (Japan)/Bounce Man (USA) -> Fuse Man)





I hope that I helped you out! I honestly though that the Dusting off of the Skull was kinda obvious. Yeah, says the guy (me) that didn't notice that reference until DookieShed pointed that out.