Cutthroat
You indulge in the violence you inflict onto others, striking down foes without prejudice. With whatever you can get your hands on, you a leave a trail of blood and viscera in your wake. Those who follow this path often start with simple, maybe noble, intentions, however the scent of death lead them into a spiral of violence.
Savagery Savant
When you choose this archetype at 3rd Level, you know how to use common objects and your bare hands to brutal effect. You gain proficiency with Improvised Weapons and can use them for your Sneak Attack, now dealing 1d6 of damage for objects that do not resemble an existing weapon. Your unarmed attacks now also deal 1d4 bludgeoning damage, using your dexterity modifier for both your attack and damage modifiers.
Disarm and "Disarm"
Starting at 3rd Level, you know how to disarm and procure a weapon from an opponent, using it against them. As a Cunning Action, you can make an attack roll contesting the targets Strength (Athletics) Check or Dexterity (Athletics) Check, If you succeed you disarm their weapon and can equip it as a free action. If you are not proficient with the weapon, you can use it with proficiency as an Improvised Weapon. When attacking the disarmed target with their weapon, you can use your Sneak Attack against them even when you don't have an advantage, but not when you have disadvantage.
Made by @fru1tycak3 on GM Binder
Art from Rye Yang (Artstation)
"Hotline Miami" belongs to Devolver Digital
Thanks to /r/UnearthedArcana for feedback
Lethal Throw
At 9th Level, you have deadly aim with thrown objects. As an attack action with either an Improvised Weapon or a procured weapon from an enemy, you can throw it as a ranged attack using your dexterity modifier within 20ft if they don't carry the Heavy or Special Property. The attack deals the weapons damage, using dexterity as your damage modifier. You can use this attack with your Sneak Attack feature.
Merciless Execution
At 13th Level, you show little mercy towards your foes. Whenever an enemy is prone, and you make a successful attack against their AC, your damage dice is doubled. You can do this as many times equal to the amount of Sneak Attack dice you have, regaining these uses after a long rest.
Bloodletting Trance
At 17th Level, you let the rhythm of death take over. Whenever you take an opponent down to 0 hit points, you increase your Sneak Attack die by 1 up to your Rogue level. You loose these additional dice if you don't deal any damage against hostile creatures after a round.