This is a pretty good matchup... I'd say this one would just come down to pure luck... As long as gir doesn't go into his duty mode, derpy would just end up destroying gir in a series of accidents, but they would have too much fun with each other to actually end up fighting... But girs duty mode would definitely give gir a huge advantage...
I'm calling it a tie. Everything would be destroyed except for Derpy, Gir, and a basket of muffins, which they would then share.
Because again you don't get it: [video=youtube;pmRAiUPdRjk]https://www.youtube.com/watch?v=pmRAiUPdRjk[/video] The basic premise of the site is that these fights are organized and overseen by the Overlords of Magic and the Overlords of Science. These beings are only beneath God and Satan in raw power, they are more powerful than Discord, they are more power than Pennywise, they are more powerful than Cthullhu or Thanos. If you dare cross them, you are wiped out from existance. In order to avoid this, the Overlords of Magic and the Overlords of Science infect the contestants with Kombat Rage. That means neither of them is gonna stop until the other is either dead or knocked out. To put it in layman's terms: my site is like Celebrity Deathmatch. You can count with the fingers of one hand the number of contestants on that TV show that refused to fight. A fight WILL Happen, and one of them WILL win. Which one is up to you. But you don't get to say "they won't fight". They WILL fight. They will always fight, no matter who the contestants are or whatever morals they have in canon.