[PFS] 2H Katana Ninja thoughts

[Iamrubocop]

I know that the ideal or optimial ninja is a TWF sneak attacker. For whatever reason, the TWF style in pathfinder isn't my favorite. So I starated thinking about a 2H katana wielding ninja.

For stats I'm thinking I'll want to make sure I have STR, DEX, CHA/CON and not to dump WIS necessarily because a Ninja will save sucks.

Something like:
STR 16+2
DEX 14
CON 12
INT 8
WIS 10
CHA 14

Also thinking human because of the extra feat.

Now some questions regarding Katana. As I understand it, a Katana can be used by anyone with Martial weapons proficiency, but must be used two handed. Anyone proficient with one, such as a ninja or samurai, can wield it one handed.
With this in mind, would a Ninja or samurai benefit from the 1.5 STR bonus when two handed a one handed weapon while wielding a Katana? Does this make sense? They have the proficiency to treat it as a one handed weapon, so do they also gain the extra STR benefit when two handing?

I'm also thinking going the feinting route to take advantage of the sneak attacks so the level one feats would be:
Dirty fighting and Improved feint.

Then I was looking at a way to increase bluff so feinting works more often and ran across nonchalant thuggery:

"You gain a +4 trait bonus on Bluff checks to keep others from noticing your aggressive actions."

My question is does this apply when feinting or just in social situations where your trying to be subtle in your threats?

Looking forward to some answers and insights!

[Bazaku Ambrosuis]

If where my game i would say no to the feat, a feint is about make a pantomime of an attack to distract him of the real one but i think is agressive. If you want to make yourself better on bluff you can use the classic skill focus (human with Focused Study and half elves can get it free)
Consider taking a dual weapon as its similar to two weapon fight, you can get a cool blade like darth maul`s and go to town. A ninja welding that is freaking awsome.
As for the 1.5 works only if you weild the weapon with two hands (despite you can have it only in one of them), also if you use a one handed weapon with two hands the bonnus go to 1.5 instead of 1

[Tyrant Lizard King]

Yes, you would get 1.5 STR for wielding it with 2 hands in any situation, just like a Longsword. Having the exotic weapon proficiency for it would simply allow you to wield it in one hand without the -4 penalty

A Feint is an aggressive action so that +4 wouldn't apply there... unless there is a feat out there that makes your feints seem less threatening.

[GeneticDrift]

Ive played a str ninja and it worked great. Wear a mithral breast plate, take the trait to reduce the acp.

Being invisible and using that rogue talent offensive defense (iirc) for a dodge bonus equal to the # of sneak attack dice you hit someone with is amazing.

Springloaded wrist sheaths for wands you can easily UMD and stay at range the first round ( fiery shurican) also umding shield and mage armor for high defenses. And perhaps a wand of flame blade if you gain proficiency.

[Iamrubocop]

Ok, so no nonchalant thuggery for feinting. Any other suggestions on traits or other ideas to increase Bluff and have feint hit more often than not?