I'm inclined to agree with Scarlet. The way I see it, either a majority of us will want our own characters to win, or we'll be indecisive because nobody wants to look like 'That Guy' for voting for our characters.
Also, you want ideas for the obstacle course, eh Saarebas? As you wish. Though I warn you, my ideas for obstacles are a bit less "live or die" and more "Impede everyone in extremely aggravating ways". In other words, these are what I lovingly refer to as jackass obstacles.
-Air cannons with trip wires filled with paint (or any other non-lethal chemical of your choice.)
-The surface of one of the platforms is completely made of roller bars.
-A few of the turrets are either loaded with shock rounds or nausea inducing chemicals contained in breakable pellets
-Platforms that use optical illusions to seem much higher than they really are, thereby inducing vertigo in some students
-Bolo launchers placed either before or after some of the jumps
-Pistons built into the rock wall that will come out at random to hit people as they climb (you can thank WipeOut for this one)