Shared Builds:
Mania's Blade and Whip
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Descend into madness and mania.
Funny armor strip with melee and Pillage.

Optionals:
[Energy Siphon] or Corrosive Projection
If you pick either of the two above instead of Steel Charge, then replace Power Drift with Coaction Drift.
Non-Umbra and Non-Primed mods can be used.

My thoughts:
This is a build that aims to give [Loki] some offensive use by stripping armor and shields from enemies then quickly killing them with melee.