A mini servitor that shoots a harmless void blast (like 1 damage) every time you press the select button. Speaks in servitor-babble and translated text will be something humorous that fits the situation (ie- when killing a servitor it says "mommy?").
It would drop from Kaliks Prime in PoE, either as a small chance to drop with every fight (like Crux) or as a guaranteed prize to be turned in to the PoE vendor (Fallen bro from House of Judgement) for 5 Void Pieces, which are obtained as a weekly drop (once per week, like raid rewards) from Kaliks IF the servitor ghost doesn't drop upon Kaliks's defeat, so you could either grind for it or wait 5 weeks.
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I'd be interested in ghost shells that had perks too, nothing crazy just similar to armor perks: damage boost vs Fallen; pulse rifle reload; radar always on; carry extra grenade (this little guy should look like a ghost hiding in a grenade), etc.