The invisible marksman, legal wall hack, one shot many kills - Cyte-09!
Passive: Gains Practiced Aim when he kills an enemy by damaging their Weak Points, increasing his Critical Chance against weak points by 1% up to a maximum of 300%, lasting for the entirety of a mission.
Seek - Plant an antenna that projects a forward wave scan. Detected enemies take increased Weak Point Damage, and become visible through walls. Weapons gain Punch through.
Resupply - Throw two Elemental Ammo Packs that instantly refill the active weapon's magazine, while granting the weapon an additional instance of the selected Elemental Damage and Status Effect. Reload clears the effect. Sniper Rifles gain extra damage.
Evade - Jump backwards and become invisible for a short duration. Killing enemies on their Weak Points extends the duration and heals Cyte-09.
Neutralize - Summon the Neutralizer, Cyte-09's exalted Sniper Rifle. Bullets ricochet off Weak Points to seek out other nearby Weak Points. Alt fire lobs a Cold grenade that completely freezes enemies.
Acquisition: Main blueprint is acquired upon completion of The Hex quest. Component blueprints are acquired from Höllvania Central Mall Bounties as an uncommon drop. Alternatively Cyte-09's blueprints can be purchased from Amir of The Hex.
Cyte-09 with Kunai Incarnon Genesis is my go-to for headshot Riven challenges now. Neutralizer is the main workhorse, Kunai for the fiddly stuff like aim glide/sliding headshots. I do wish I could slap Stabilizer on Neutralizer, since the kickback is pretty intense.
My main criticism is that he's another "greedy" frame that competes with squadmates for kills to upkeep stealth and headshot bonuses, and it can be challenging to find those headshots when you regularly play with war criminals who favor frames like Wisp/Dante/Mesa.