Yes, you can play PUBG on Redmi 6.
Yes, Redmi 6 does have a fingerprint scanner. It also supports the face unlock.
If you use the supplied 5W charger, it charges to 18 percent in 30 minutes and 35 percent in an hour.
No. Redmi 6 does not come with the earphone in the box. You need to buy it separately.
If your budget absolutely can’t exceed the Rs. 8,000 mark, go with the Redmi 6 without any concerns whatsoever.