Uhhhhh... Setting? Mission? Purpose? Background? Location? History? Gods? Time Period? Nation? State? City?
Here's one:
Vort Shipwright
Vort is a halfling who is the son of a shipwright. Vort had a tendency to accidentally injure other halflings on the worksite all the time. It's because of the high rate of injury on the job that his father finally told Vort, "Son, you have a real knack for injuring people. I think you should become a professional killer." Thus Vort Shipwright was sent off to work for the gods of death.
Vort is a follower of the God of death and damn cheerful about it too. He's Lawful Good, fast as hell and just happens to be really into killing things. He became an adventurer so he could kill things. He's nor morbid about it, he's just thinks it's his calling in life... to end it. He hates undead, because his goal is to send things onto their just rewards and undead hang around too much. After all, when you die, you go to the place you deserve to be, so gosh darn it, why put off until tomorrow what you can do today!
So, lets see... Base stats... 15,14,13,12,10,8
Str: 12 (14 -2 for race)
Dex: 18 (15 base +2 Race, +1 at 4th level)
Con: 13
Wis: 8
Int: 12
Chr: 10
Feats:
Level 1 (Fighter 1)
Exotic weapon focus: Crescent Blade
Combat Reflexes
Level 2 (Swashbuckler 1)
Weapon Finesse (Crescent Blade)
Level 3 (Fighter 2)
Dodge
Two handed weapon fighting
Level 4 (Fighter 3)
Level 5 (Fighter 4)
Karmic Strike
Level 6 (Fighter 5)
Improved Two handed Weapon Fighting
Level 7
Double Hit
Total Levels: Swashbuckler 1/Fighter 6
Equipment (WBL 17,000)
+1 Crescent Knife (Shocking) 4,000
+1 Crescent Knife (Sonic) 4,000
[See Dragon Mag #275, New Exotic Weapons)
the other 9k in gold is for armor and other defensive stuff.
If someone tries to hit you, you get to attack first (Karmic strike) and use your off hand (Double hit) with your crescent knives (two attacks for every one) for 4 attacks at 1d3 + 1d6 + 2 for an average of 7 a hit, and you have a chance to hit of (BAB 7 + Dex 4 + Weapon Bonus 1 - Two handed fighting -2) of 10.
You have 4 AoO, a BAB of +7, and Improved two weapon fighting, so, in theory, if there are four different attacks against you and you do all your attacks in a round, you will get 24 attacks a round. Against an AC of 20, you hit 50% of the time, assuming the enemy doesn't have electrical or sonic resistance, you do an average of 84 points of damage a round, give or take.
He's a one trick pony, but a fun trick none the less.