The vehicles from Cars may be a bit awkward to be actual heroes, but what if they were used as the cars in the Guild War. It would also be easier to relay strategy if they had names (we could say attack Lightning McQueen first rather than bottom row, middle car).
I strongly suspect the cars are from the new Wreck-it-ralph movie. As for coordination, you could simply use coordinates
3a, 3b, 3c
2a, 2b, 2c
1a, 1b, 1c
corresponding the floor the car is in.
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Also the cars in guild war have names too