I won't do all 4. I won't touch the Shifter. I simply don't have any experience with those, I will leave that to someone else.
Here is my interpretation of the "staff" fighter (and your dual wield template as well).
In NWN, Fighters use staffs that have metal ends for more damage. So
the "staff" is a Dire Mace:http://nwn.wikia.com/wiki/Dire_maceSince this is also counts as a dual wielded weapon and requires the dual wield feats, this is
also your dual wield fighter (strength based) model. Simply replace "Dire Mace" with another weapon.
Dire Mace is something of stylistic choice. It has the advantage of a full size weapon in the off hand without penalites. But it also limits the benefits you could get from totally different second weapon.
My choice would either be Katana or Bastard Sword. Both do 1-10 damage and both are very cool looking weapons. Then you use whatever you want in your off hand. Preferably somehting light to not incur more penalties.
Bear in mind that you off hand doesn't double your attacks, you only get 1 off hand attach when you might have 4 first hand attacks. When you get improved two weapon fighting you get 2 off hand and that is it. Also your off hand only gets half strenght bonus to damage. So your off hand can benefit you more by extra abilities of your weapons. Say you have a Superb Katana in your main, if you find a short sword of speed, use that in your off hand, you benefit more from the haste than off hand attacks. Anyway those are some things to consider when choosing your weapons to specialize in for dual wield.
Choosing Katana/Bastard/Longsword as your #1 allows you to:
Choose the best of small off hand weapons for their benefits.
Pull out a shield when you are in a bind to dramatically boost your AC.
Dual wield Katana/Bastard/Longswords when you are feeling silly and facing weak oppononents.
Other features of the build. Rogue skills are quite robust. You can have full searching/lock picking/trap disarming/ UMD/Tumble and a couple of others. Basically almost all the needed skills for adventuring.
Weapon focus at level 3 so you find more weapons of your type.
CoT as third class, mainly to boost saving throws (excellent Fortitude,Reflex, Average Will).
Tons of feats.
Rogue(4), Fighter(6), Champion of Torm(
, Human
STR: 16 (20)
DEX: 15
CON: 14
WIS: 8
INT: 14
CHA: 8
01: Rogue(1): Ambidexterity, Two-Weapon Fighting
02: Fighter(1): Weapon Proficiency Exotic
03: Fighter(2): Toughness, Weapon Focus: Dire Mace
04: Fighter(3): STR+1, (STR=17)
05: Fighter(4): Weapon Specialization: Dire Mace
06: Fighter(5): Power Attack
07: Fighter(6): Cleave
08: Rogue(2): STR+1, {Evasion}, (STR=18)
09: Champion of Torm(1): Iron Will
10: Champion of Torm(2): Improved Two-Weapon Fighting
11: Champion of Torm(3): {Smite Evil}
12: Champion of Torm(4): STR+1, Blind Fight, Improved Critical: Dire Mace, (STR=19)
13: Rogue(3): {Uncanny Dodge I}
14: Champion of Torm(5)
15: Champion of Torm(6): Knockdown, Great Cleave
16: Champion of Torm(7): STR+1, (STR=20)
17: Champion of Torm(
: Improved Knockdown
18: Rogue(4): Resist Energy: Cold
Max Hitpoints: 218
Saving Throws (Fortitude/Will/Reflex): 18/10/18
Skillpoints: 147
Disable Trap 20(22), Listen 20(19), Open Lock 20(22), Persuade 20(19), Pick Pocket 6(
, Search 20(22), Tumble 20(22), UMD 21(20)