I'm assuming...
Monster: Zerg
Human: Terran
Robot: Protoss
Continuing with the guessing...
Zerg:
-Melee, Drone/Ling/Ultra
-Range, Hydra/Lurker
-Flying, Muta/Guardian
-Special, Overlord/Defiler/Queen
Terran:
-Range, Marine/Ghost
-Vehicle, Goliath/Tank
-Ship, Vulture/BC
-???
Protoss:
-Melee, Zealot/DT/Archon
-Range, Dragoon/Reaver
-Ship, Scout/Corsair/Carrier
-Special, Arbiter/Templar
I'd be surprised if I got half of them right.

EDIT: Btw... cool idea
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4.