One thing I always love to do in cRPGs is to find unigue builds that are fun and work. Many games feel like there is just one build that works, but a great RPG will let you build your own way and be viable and have fun.
One character I try to build, and usually it fails miserably, is a dual wielding light weapon, lightly armoured fighter. Usually it just doesn't get the damage output and they die since they can't take damage.
Today I was bored with my last character and know more about the game mechanics so I started over and bumped the difficulty up to hard. I made a wood elvish barbarian dual wielding hatchets.
mig 16
con 14
dex 17
per 12
int 8
res 11
Even though the race is bad for the class, and I have really high dex for a barbarian, but low con, might, and int, she surviving much better on hard than my high con, might and 14 int 2h sword barbarian was on normal difficulty. The hatchets give +10 deflection and attack fast, especially in hide armour, allowing her to tank a bit for tough opponents and then frenzy weaker ones.
It would be great to see if others have come up with other builds that shouldn't work but are working and having fun with them.