Nin-ja:

Thief Kit

Advantage:

Thief bonus 40 each level
Gain +3 to hit and +3 dmg in the beginning
Can specialize in the following weapon:
Long sword, Nija-to, Katana, Short Sword, Dagger, Scimitar, Wakazushi
Cast charm animal every 6 levels

speed +3 when reach level 16

Ability: Cast Blur once per day when level 9 (twice at level 18)

When reach level 14, gain ability Kill (however you name it)
Description of Kill: with a successful backstab, there is a percentage the target is caught TOTALLY unware, and the sword strike him dead.
Level 14: 5%
Level 17: 7%
Level 20: 9%
Level 23: 11%

Disadvantage:
human only
may not use weapons of those he cannot specialized in
may not set traps
use lesser backstab modifer
-1 to strength
-10 max HP
minimum Wis: 12
minimum Int: 12