Rash is one of the protagonists of the Battletoads franchise, alongside Zitz and Pimple. He was originally a human game tester named Dave Shar, who much like his buddies was transformed into a toad upon entering the Gamescape. Rash is the coolest toad (so he says), being the most extroverted of the team. He is easily identified by his green skin and shades, and is the most agile of the team, using sharp weapons on his Smash Hits.
While I'm not a huge fan of the 90's and its "woah radical bro" garbage, Michas has a bit more charm for me, and isn't completely annoying. Chiplock does "bombastic" well enough, but it comes across as annoying to me.