I would bet there's a common power circuit here. First step is check all the fuses and replace the one that is blown. Then take a look at your #6 plug wire for a mark on it where it's likely laying on metal and arcing out.
Did a little wire diagram reviewing and everything you mention except cylinder 6 misfire has common power supply.
Powertrain relay #40 feeds two fuses numbered 10 (Emission) and 14 (O2 SSR) in the fuse box.
Check the relay/fuses above and that plug wirre and you should be all fixed up
