I like the idea of the power weapons, because it's a little weird that a chainsaw does the same amount of damage as an axe or something.
Here are some weapons you'll be seeing from the civilians:
Hunting rifles, crossbows
Mounted machine guns
Hatchets, pots & pans, knives, etc. (I like to count random objects made out of metal as hand weapons instead, it just seems fitting)
Random objects (planks of wood, brooms, etc.)
Chainsaws, buzz saws, jackhammers
Makeshift spears, halberds
Homemade bombs (these would be simple Mk1 explosives)
I also have a hero in a hardsuit, who I'm planning on giving a couple bodyguards.
Hero: polearm, shield, feet with talons
Bodyguards: I haven't built them yet, but I'm probably going to arm them with swords and shields, and maybe some sort of interesting special weapon.
The hero could also be involved in the backstory of the battle. For example, he might be on the run from the Assyrians and the Super Jews, and he's rallied some civilians to help him fight them off? I guess we can think of something.