Yes, LG Q6 Plus is a metal body phone.
No. LG Q6 Plus does not have the fingerprint scanner but it comes with advance level face recognition.
No. LG Q6 Plus comes with 1.2 A power charger which is not fast charger. But you can use Sony CP-AD2 USB charger to charge LG Q6 Plus faster.
LG Q6 Plus has 3000 mAh Li-Ion battery which offers talk time of about 16 hours and standby time of about 200 hours.