The necromancer, master of the dark arts, the original loot frame - Nekros!
Passive: Nekros and his Companions regenerates 5 Health when an enemy dies within 10 meters of him.
Soul Punch - A blow so powerful, it turns the enemy’s very soul into a deadly projectile, damaging all in its path.
Terrify - Casts fear into the hearts of nearby enemies, causing them to run away in terror.
Desecrate - Forces fallen enemies around you to drop additional loot.
Shadows of the Dead - Summons shadow versions of vanquished enemies to fight alongside you for a short period of time.
Acquisition: Main blueprint can be purchased from the Market. Component blueprints can be obtained from defeating Lephantis on Magnacidium, Deimos.
My other counterpoint to this perspective is that, when I’ve had the absolute joy of playing with range Chromas, having Vex Armour buffs on is fun. He’s an easy Circuit pick for me, because like Banshee he directly makes the game more fun for everyone. Vex Armor also outscales Roar until 700% power strength, and outscales Roar forever on glaive maths and MultiCO projectile melees. (Ignoring certain triple dipping Roar mechanics, such as Blastfluence.)