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Dex char are pretty straightforward to build but not to play.

For build, just go expert 3 marksman/3 or 4 scoundrel/5 sneak with dagger as main weapon and bow as backup. All you need for talent is backstab, guerrilla with an optional bully depending on the party composition; the spare talent points are not important, it's actually better to "convert" them.

Expert marksman key skill are: tactical retreat, rapture, infect and to a lesser extent mute, first aid and doctor.
Scoundrel key skill are: charming touch, eye gouge, trip, razor edge, walk in shadow and to a lesser extent fast track, cloak and dagger.

This type of character has 2 charm and 3 different crowd control move. Due to how charm works, that is to say a dex character can have 2 summon (charmed enemy are usually better than summon) and has the potential to disable 5 enemies at once.
Defensive wise, sneak + a lot of disabling move means you will never be targeted. And even then, you have 2 teleport move as well as 1 invis move for tough situation.
The character is better in melee situation but has the potential to fight at long range thanks to special arrow and easy sneak + bow attack.

Thanks to sneak and guerrilla, wether range or melee, you have the highest single target dps of all builds.

The only downside to dex character is they are not as straightforward as warrior or mage. There is a lot of possibilities (attack? disable? hide? fight at range? go in melee?) which means they can either shine or be completely useless according to player choice.

As a general guideline, the first and second turn should be used to charm and disable melee enemy. On the third turn or more, it is good to sneak behind and take out the enemy ranger/mage.