Pawns- Minions
Expendable minions that are the forgotten heroes of the entire fight. Are usually easily killed by the other pieces, but are still needed to win 100% of the time.
Rook- Fighters
Typically are easy to see what they will do next and are predictable based on who they are. However, their power still makes you have to react to avoid or kill them.
Knight- Assassin
Overrated, but for a good reason. The ill prepared will be meat for the Knight with his slightly unpredictable movement and large range of movement.
Bishop- Mage
Use their out of the ordinary movement to surprise the enemy with deadly tactics. Are more predictable than Assassins, but are just as hard to play around with more range.
Queen- Support
The King's most powerful ally and who he can always rely on. If all else dies, chances are the Support is still there to support the King aka Marksman.
King- Marksman
As long as they live, the game goes on. If the King goes in first, you will lose 99% of the time. If they wait for the enemy they will win majority of the time. Are usually the least mobile, but can move more than one direction unlike Pawns/Minions.