Originally, I was going to have Doc Robot indicate a change in special weapons by having the robot master in question (I.E. Bubble Man for bubble lead, Wood Man for leaf shield) super-imposed over Doc Robot, kind of like how it was in the original games, except simpler. While I was actually making the comic, though, I got the idea to show what weapon he's using the same way Mega Man does, with a colour-palette change! Oh, and if you're wondering, Doc Robot has a regular buster to use while 'normal' (and, while using the Time Stopper too).