LG Q6 Plus is available in 4 different colors - Black, Blue, Gold & Platinum.
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.
Yes, LG Q6 Plus does have the VoLTE support.
Yes, LG Q6 Plus does have the FM Radio.