Sothisq
have cortanna hack penny and take it over i tink i remember her being top of the line atlas tech and if you can get the blue genie even better. and you should have rias reincarnate that spear girl (whos name starts with P) as a knight. also i can see the food wars chick cooking for ruby and getting her aura unlock. but besides her i dont see the others getting it naturally but i do see her and rias' new knight unlocking it for others after the mission