The war between ghouls and humans ended up being a very bloody set of conflicts. Many humans died protecting their home from the sinister ghouls. They called in the Ghost Buster, but not even that was enough when Choke entered the scene. So the Humans needed some back up. They called in a unit from space who has a long history of getting things done. The Terran Firebat.
Fire it up!The Terran FirebatThe Firebat is slow, a bit slower then a cyborg. He also stomps about making himself a noticeable target and the sound of the pilot light means he cannot hide from the ghouls. However, he wears heavy armor that allows him take more hits then other humans. He can survive attacks that should ohko other humans (with the sole exception of the creeper). This is to make up for lack of speed and how of a target he is while using his weapon (to be explained next paragraph.)
The Firebat comes armed with dual flamethrowers to fry some ghouls. These powerful burners can take out even a Jitterskull before it can get close enough to do any damage. However it comes with its own brand of problem. While in use, the flamethrower obstructs the Firebats view. Making is easy to loose sight on where the ghouls are. It is loud and bright, the Creeper can easily sneak up on a Firebat, and being bright flames, other Ghouls can easily see where the Firebat is fighting. To avoid harming himself, the Firebat is forced to move even slower. If things are becoming too tight however, the Firebat has another trick up his flamethrowers, by moving his arms backwards, hes capable of using the flames to accelerate movement, moving faster then even a Hunter or Choke. He can even charge through the air. However while using this flame acceleration, changing directions is very difficult, so the Firebat has to let go of the alt fire to change directions. Using this method to get to higher elevations and escape the ghouls when they get too close. Offensive wise, this ability does minimal damage, and can push ghouls out of the way.
Once the Firebat runs out of fuel for his flamethrower however, he looses the ability to use the flame acceleration, the flamethrower becomes slower, looses a bit of range and is weaker as well as attack in bursts of flame (much like how the Firebat attacks in Star Craft)
Theoretical Counter-Measures
Sjas: Alt Fire is a gamble. While you can burn a Firebat to death on his own flame, a smart Firebat will wait you out, and start burning you again as you head to vulnerability. For attacking, just get around and scream.
Jitterskull: May be difficult, but ambushes are probably your best bet. If that Firebat is sitting in a corner, it may be a bit harder.
Creeper: Your small, fragile and will die fast to the flames. Keep in mind the Flamethrower is almost certain to obstruct the Firebats view and is noisy enough to shadow the creeper. Trigger happy Firebats will have troubles dealing with creepers.
Choke: The Firebat lacks the ability to use long ranged attacks, blood balls could work here. Else wise, for the safest bet, just make hit and run attack, unless your positive you can kill the Firebat. Just remember, the Flamethrower can make short work of you and you are the most vulnerable ghoul. for being hit by that.
Frost Bite: Unknown.
In all cases: a Firebat without fuel is easier to kill and less threatening, just be sure not to get too cocky. Just be sure to remember, the Firebat has armor that allows him to take some extra hits, so unless your a creeper, or maybe the blood ball, normal OHKO tactics may not be as advisable. Last but not least, don't forget, the Firebat can also be one of the fastest classes due to his alt fire. However he can only move in a straight path and has to stop to make a turn. It can also allow him to fly through the air in a straight path, depending on the direction hes facing.
This class would allow humans to have a class that can take more hits then any other human class. He can handle himself against waves of incoming ghouls, and has the ability to also get out of there if things get too tough. However the flamethrower itself is also a disadvantage as its noisy, bright and obstructs view.
...Is something burning?