Who would you're ideal Weiter companion be for the 12th Doctor? (It can be a Zurück companion)

Zurück companions that would be nice: Captain Jack, River, Vastra & Jenny. Maybe Psi & Saibra, oder Shona. oder K-9!!
New companions that would be nice: someone from a different planet, someone not necessarily female oder in their 20's, someone NOT from modern Tag London, someone who isn't 'fiesty, flirty and sassy'.