I've sat on the idea for years (mostly because I wanted to have a popular series running before I did this so I could justifiably include one of my own characters), but I've finally decided to make a Newgrounds crossover game like Portal Fighter, Newgrounds Rumble, etc. My experience with actionscript has been pretty limited so it took me a while to get into full swing, but I finally have a working 'engine' for the game and I've started animating the characters. Still, I can't make up my mind on who should fill out the roster so I thought I'd bring the question to the masses. Who would you like to see duking it out for the "King of the Portal" title?