I've got an idea kicking about for a goblin rogue who battles with two torches. the core of which is Burn!Burn!Burn! and Fire Hand feats.
There's a lot I can do, but I'm concerned about weapon viability as he progresses.
Right now 3rd level, he can strike a flat 1d2 base +1d4+1 for feat bonuses. before sneak attack dice. The primary stopper is the the damage cannot come from magical fire sources, so I'm stymied at the moment on improving weapons as he rises in level to remain competitive.
My first thoughts are a battle aspergillium and alchemist's fire. I could enchant the weapon itself and maybe treat it as a torch? but then for me that's bending the rules a bit, and I wouldn't consider it an actual torch for game mechanics.