As I doubt there is a 16th person around to fill the last spot, I shall use my mind and create some wonderful machines.

Name - Boxy
Shape - A box with a back rest coming out of the top
Speed - 9 mph
Weapons - Its silly face on the front
Drive - 3 wheel drive, powered by 3 electric wheel-chair motors
Armour - 10mm corrugated fiberboard attached to a wooden chassis
Notes - It has a random office chair in the middle of the machine, dont know how it got there and serves no purpose.

Robot 2

Name - Shiny Happy People
Shape - Box with wedge
Speed - 4 mph
Armour - 10mm corrugated fiberboard attached to a wooden chassis, but with some shiny old Robbie Williams CDs attached to the outside, so it looks like a mirror
Weapon - It has got a shiny wedge
Drive - Some windscreen wiper motors for 4 wheels.

Right