No. LG Q6 Plus is not a waterproof device.
Yes, LG Q6 Plus does have the dedicated MicroSD card slot.
Yes, LG G6 Plus does support VR. It has the Gyroscope sensor.
Yes, LG Q6 Plus does have the face recognition. You do not even require to power up your phone. It's camera automatically detects your face and unlocks the phone more quickly than typing, drawing or fingerprinting.