I decided to see how powerful virus Roll was. After failing with Blast Man (his jump lob was always getting stuck) I succeeded with Acid Man. Kind of. I don't know, maybe Acid Man was dealing something and irritated Roll enough to have her fight him. Something something lore. Because Acid Man has Acid Barrier and Speed Gear, he takes 2 damage every hit. The fight ends when Roll goes normal or Acid Man dies. Wait enough time and both happen.
scratchmega_man for Acid Man's AI RhythmFan for CAI - Roll...? Me for suffering about a week trying to figure out the kinks