[Help Wanted] Optimizing an Unchained Rogue

[StrengthofMany]

This is actually for a player of mine. I haven't played with a Rogue since 3.5e, so I'm stumped on what advice to give him. How would you optimize an Unchained Rogue to be the best that they can be?

As a caveat, the other party members so far are a Cleric (no details yet) and a Sorcerer (leaning toward Drow or Gnome with Slyvan bloodline.)

[Florian]

Well. Unchained Rogue is still king of the hill when it comes to dealing raw damage. So engaging in the TWF feat chain with Short Swords or Wakizashi certainly is a thing.
Should your Cleric not pose as a flanking buddy, this´ll get a bit more complicated. This´ll mean engaging in Ki Pool and some ninja powers, especially Vanishing Trick ( and a Shosubo of the Night Sky) to pull it off.

Before going deeper into it, I´d actually propose you getting your Cleric and Rogue player to talk about general tactics and go from there.

[Secret Wizard]

This may be handy. (https://docs.google.com/document/d/10X33NTVDs7e7f9SYsagARLgIEM9tgy7ilKViC-4xin4/edit)

The Nimble Skirmisher can flank with itself, so you could go with that in order to avoid needing a flanking buddy for sneak attack.