Support Hero [Harrow]
This build focusses on providing your team with health and energy, synergizes well with [Nekros]' [Shield Of Shadows] ability since you can heal the Shadows and keep them alive.
Get your 3 going so you have a source of energy, start trapping enemies with your 1 to build up overshields, and then keep your 2 up using your overshields. Keep this loop going.
Your 2 will provide lots of healing to you and your team while your 3 provides energy. The firerate and reload speed buffs synergize well with weapons with large ammo pools that do not suffer from ammo shortages, e.g. [Ignis Wraith] and [Amprex].
This pattern of slot polarities also works great for Eidolon [Hunt] builds.