Let's see... I tried making a dwarven alchemist "hurler" once... on the theory that acids and alchemist's fire, et al are kind of something a dwarf, who is in touch with minerals, could get into based on the fact that it's "chemistry." Rather than fight with axes or fire bows, he had a bandolier with all sorts of alchemical mixtures that he would hurl at opponents - and constantly spent his "down time" tinkering with and coming up with new ones.
One of the fun side effects about this, though, was that he knew that the only real effect he could have came from the alchemical substance itself - critical hits, weapon mastery, et al, weren't exactly applicable. So he became a master tactician and engineer and was, often as not, looking for ways to use his alchemical substances to control a battlefield (tanglefoot someone in place or use several thrown flasks of oil followed by an alchemist's fire to create a "wall of fire" to separate opponents from each other) and/or cause chain reactions that were more deleterious than the effects of (al)chemicals themselves - things like tossing a "rust potion" on a metal chain holding up a chandelier (and causing it to drop on those beneath it - old trick, I know) or firing off "bloat balls" at opponents' weapons to effectively disarm them without destroying the weapon (think of the black, expanding, sticky balls that are used to immobilize Mr. Incredible in Syndrome's fortress, if you will). Basically, my style was "I will throw everything I can think of at you to discombobulate and defeat you EXCEPT a direct frontal assault."
So I guess he was an "(al)chemical warfare" fighter. VERY unconventional - and loathe to use the same trick twice - but then, that's why he was so freakin' effective - I always had 2-3 "new moves" the DM hadn't anticipated. I loved him because he fought with smarts and tactics, not with brawn (high Int, high Dex, low Str, low Con). Fortunately, the rest of the party (more conventional hack-n-slashers) appreciated the sense of tactics I brought to the group, and more often than not I was back with the wizards working as a "field general" directing the front lines while lobbing alchemical substances here and there to help them out.