Opportunist

Rogues have a reputation of staying back, bouncing in and out of combat to find the opening. Not you. You like fighting in the fray and letting your foes make mistakes and leave themselves open.

Main-gauche

When you choose this archetype at 3rd level, while wielding a dagger, you earn +1 to your AC passively. You can also use your reaction to raise your AC by 2 until the end of your next turn. 

Deadly Blow

Starting at 3rd level, you can maneuver your enemy into your favor. Once on your turn, when you take the attack action, you can instead attempt a deadly blow with a dagger. You land a critical strike on any roll 15 or higher. This threshold is lowered by any attack bonus items. Anything lower you miss. You can use this a number of times equal to 1/2 of your level in this class per long rest. You only lose a charge when you hit.

Expose Armor

Starting at 9th level, when you hit with a Deadly Blow, you lower the AC of the target by 2 until the end of your next turn.

Trick

At 13th level, When an enemy makes a melee attack against you, you can use a reaction trick an enemy into attacking another creature. The creature must make an INT saving throw or attack another creature of your choosing within 5 feet of the attacker. You can do this up to a number of times equal to your proficiency modifier. 

Exposed Enemy

Starting at 17th level, when expose armor is active on an enemy, the critical threshold on deadly blow is lowered by 2 and it's AC is reduced by an additional 2. These effects can stack.