This is Seraph, the 7'1" Heavy Mobile Sentry Robotic Combatant built in the Old World to serve as a Vault Keeper during the Great Clockwork War. You find yourself married to her out of pity for her apparent daughter, despite her not being designed for reproduction. Despite your initial near-death experience when she found you, you find that she is actually quite motherly and protective...despite being an ancient war machine armed with miniguns, rocket pods, and even an experimental railgun.