Useful feats for a one-weapon rogue?

So I decided to make a one-dagger rogue for an upcoming campaign a friend is running...
But I'm a little stuck on feats. Class is unchained rogue "ninja"(since as far as we can tell, it can be applied in a similar way to an archetype), and the race is human.
So far I've gone with possessed hand... And maybe wave strike and combat stamina?
It's level 7, and we're using the automatic bonus progression system, giving me a stat layout of 10 str, 20 dex, 10 con, 14 int, 10 wis, and 15 cha.

Weapon-wise, I'm aiming for a focus on wielding a single dagger, maybe with an offhand shield to boost defenses.
As for skills... acrobatics, bluff, disguise, perception, and stealth for sure.

Improved Feint, Press to the Wall, or Circling Mongoose should let you apply your sneak attack more often for varying degrees of feat investment

The Deific Obedience for Pharasma is pretty nice.

If you've got enough other frontliners in your party, Gang Up.

If you want an off-hand to boost defenses, perhaps a mithral heavy shield would be good? You don't actually need shield proficiency in this case as it gives no armor check penalty, meaning you get the +2 AC without a problem (before enhancement bonuses).

Of course, a magical buckler would work fine as well. It also leaves your hand open to manipulate things like potions and such.

I have to mention a fun build I'm trying with butterfly sting, I planned it with a fellow fighter who now carries a scythe. I try to make the most attacks I can, with the higher crit range I can reach, and as I don't get a lot of benefit from critting, as most of my damage comes from sneak attack, agile weapons, etc. I give my crits to the fighter, who is heavily focused on maxing his critical damage. We work as a tandem and it's pretty cool.

I'd want the flexibility of a free hand, so a buckler would be preferable.

You might like weapon focus and then slashing grace; +1 attack, +5 damage is a decent return on investment for a couple of feats. That works with a buckler but not a heavier shield.

Another way to spend feats is to make you even stealthier. Skill Focus then Dampen Presence perhaps. Or just throw one or two at Extra Ninja Trick.

I have to mention a fun build I'm trying with butterfly sting, I planned it with a fellow fighter who now carries a scythe. I try to make the most attacks I can, with the higher crit range I can reach, and as I don't get a lot of benefit from critting, as most of my damage comes from sneak attack, agile weapons, etc. I give my crits to the fighter, who is heavily focused on maxing his critical damage. We work as a tandem and it's pretty cool.

Other good weapon choices for this include the Pickaxe and Tetsubo (which is the coolest weapon out of the Eastern Weapons block). The Naginata and Hooked Lance are both martial as well, and they also have x4 crits like the other weapons, but they're reach. Take that as you will.

I'm actually going to be doing exactly that setup with my Unchained Summoner and his Ancestor Eidolon (fighter version). The summoner will fish for crits while the Eidolon murders the enemy.

But yeah, @OP: If you have party members that like high crit multiplier weapons, Butterfly Sting is awesome.

You might like weapon focus and then slashing grace; +1 attack, +5 damage is a decent return on investment for a couple of feats. That works with a buckler but not a heavier shield.

Another way to spend feats is to make you even stealthier. Skill Focus then Dampen Presence perhaps. Or just throw one or two at Extra Ninja Trick.

My post responding to this seems to have disappeared -- I was saying that you don't need Slashing Grace with an Unchained Rogue, since Rogue's Finesse gets you Dex-to-Damage for free with 1st chosen weapon at 3rd level, 2nd at 11th level, and 3rd at 19th level, and this even works with weapons (Estoc(*), Elven Branched Spear, and Elven Curve Blade come to mind) for which no Dex-to-Damage feat exists.

(*)Conceptually sounds like it should work with Fencing Grace, but Rules As Written have no provision for this.

Ok so, i KNOW this isn't going to be optimal, but for a dude with one dagger, this is just the quintessential hand on the shoulder knife in the guts feat.

Piercing Grapple

avr wrote:

You might like weapon focus and then slashing grace; +1 attack, +5 damage is a decent return on investment for a couple of feats. That works with a buckler but not a heavier shield.

Another way to spend feats is to make you even stealthier. Skill Focus then Dampen Presence perhaps. Or just throw one or two at Extra Ninja Trick.

My post responding to this seems to have disappeared -- I was saying that you don't need Slashing Grace with an Unchained Rogue, since Rogue's Finesse gets you Dex-to-Damage for free with 1st chosen weapon at 3rd level, 2nd at 11th level, and 3rd at 19th level, and this even works with weapons (Estoc(*), Elven Branched Spear, and Elven Curve Blade come to mind) for which no Dex-to-Damage feat exists.

(*)Conceptually sounds like it should work with Fencing Grace, but Rules As Written have no provision for this.

Oops. OK, ignore my first paragraph then.

I will continue my preaching on daggers then: Deific Obedience: Pharasma +2 Sacred/profane bonus to attack with daggers. And if you pick the "River Rat" trait you get +1 damage with daggers.

Knife Master archetype.

Scout archetype & Spring Attack feat.

This next strategy is a big investment, & probably more useful to a rogue that uses a reach weapon, but I'll include it just incase you might like the idea.
Racial Heritage feat (Halfling)(or be a Halfling), Defensive Combat Training, Perception & Stealth - 5 ranks, Halfling Opportunist - 5 levels. This will give you 2D6 extra sneak attack damage & the ability to do sneak attack damage any time you make an attack of opportunity.

& as others may have mentioned, Stealth should be as high as you can get it to catch enemies flat-footed.