No. You cannot change the color of the notification light in LG Q6 Plus.
No. LG Q6 Plus does have the LED notification light and it also has the Always-On display.
LG Q6 Plus has 5.5 Inch Full HD+ FullVision display which offers 493 PPI display resolution. LG G6 Plus also has Corning Gorilla Glass protection.
Yes, LG Q6 Plus does have the VoLTE.
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.