|The following is based on Renegade 2 and has not been confirmed by canon sources.|
The flame trooper is an infantry unit that was supposed to appear in Renegade 2.
Wearing a special, rudimentary hazmat suit, the flame trooper is a deadly close-quarters soldier.
The flame troopers appears in Renegade 2 concept art. Whether or not he'd appear in the finished game is unknown.