Infiltrator

I could explain what an infiltrator rogue is but it wouldn't matter since it could be a family member, friend, teacher or even employer but by the time you realize who they are and what they can do your already dead.

Infiltration expert

Starting at 3rd level, whenever you take the dash cunning action you can hide at the end of your dash.

Quick Thinking

Starting at 3rd level, You gain advantage on initiative and deception checks

Improved Uncanny Dodge

Starting at 9th level, Whenever you use uncanny dodge to reduce damage from an attack, you can move up to half you movement speed without provoking opportunity attacks from the attacking creature.

Frenemy

Starting at 13th level, Whenever you roll for initiative you can choose to make an additional deception check against all hostile creatures insight.
Every hostile creature that failed its insight check regards you as a friendly ally until you, attack any of them and that target survives, or attack one of them without sneak attack.

This feature only works on creatures who can understand you.

Betrayer

Starting at 17th level, When you attack and hit a creature under the influence of your frenemy feature with a sneak attack it automatically becomes a critical hit