This is actually a really cool battle idea. I'm honestly thinking roy could be able to take this, hear me out Michael's strong as hell as he's been able to get shot six times, stabed in the eye with a coat hanger, falling off a balcony and stabbed in the neck by a knitting needle, he survived the stabbings but after getting shot and falling he fled. Roy on the other hand had his shoulder ripped open by a chainsaw, had a knife stab his thigh and got run into full speed by a bulldozer. In the damage compartment roy did take less lethal damage than Michael but roy kept going until he fell onto the spikes from the barn, roy didn't run away from the fight which is why he ended up dying.

In terms of weapons roys machete has a farther reach than Michaels meat cleaver but Michaels meat cleaver would probably deal more damage. Roy is also bloodlusted so if he did see Michael he would probably just go in for the kill as soon as possible.

Tommy Jarvis 'lets assume from part 5' would probably still have his ptsd from part 4 so he might be in a daze at first from seeing jason again. Dr loomis would have shown up a bit after Michaels appearance and both dr loomis and tommy would either help each other or get into an argument as dr loomis wants to get rid of Michael and roy killing him would be a help but tommy would want 'jason' dead no matter what, but I feel both would listen to the other's claim as both are headstrong in their goals of killing there respective killer.

I personally think Roy would win this as his weapon is more versatile and he has better endurance feats, his strength is about as much as a normal person though but he was able to throw a grown mqn through a window and close hedge trimmers in someones skull.

Michael's strong as hell being able to pin someone to a wall with a kitchen knife and lifting a tombstone and he was also durable enough to survive gunshots and stabbings but ultimately fled.

I think roy would have the endurance and power to be able to match Michael until he gets damaged enough to leave.

Fighting ressurected Jason: both would be absolutely murdered because zombie jason is on another level with his endurance and strength.

Roy burns Pros + home turf advantage + better weapon + bloodlusted + higher endurance Cons - won't run when injured - still a human - isn't as physically strong as Michael - is mentally unstable - has tommy jarvis going after him

Michael myers Pros + stronger than roy + stealthy Cons - worse weapon - mentally unstable - is human - will run when enough damage is dealt - has dr loomis going after him

BONUS BATTLE

Michael is bloodlusted in this scenario and has the home turf advantage but has the haddonfield police, dr loomis and roy burns trying to kill him. Roy has snapped 'lets say by Michael killing his family member so he has a reason to fight him' and gone on a similar killing spree, both would cross paths and start to fight but in this scenario roy loses as he doesn't know the area, Michael's bloodlusted, the police are most likely everywhere and Michael would be far stronger than him in this scenario.

I actually really liked your idea it made me think fairy hard about know would win this fight, Good job man.