Idle animation test thing

So basically Imma make a game-looking animation (Oh btw is anyone interested in helping a bit?) in a top-down perspective, which takes place in an alternate 1997, where Alien Bugs have taken over a small town, and a group of US Soldiers supported by 1 M2 Bradley and transported by 1 M113 and 2 Humvees was sent to deal with the alien menace

I need suggestions for weapons and maybe even some help making them

There will be 4 weapons (so far anyway)

1. M9 (Pistol)
2. M16 (Rifle)
3. M249 (Machinegun)
4. M37 Stakeout (Shotgun)

And there will be 6 varieties of normal enemies
1. Drones (Regular combat bugs, nothing special about them)
2. Wasps (They can fly and sting, but are small and have stupidly low health)
3. Guards (Heavily armored and high damage-dealing, despite that these slow bugs can easily be dodged)
4. Burrower (Basically giant alien trapdoor spiders that hide under crudely covered entrances and pretty much instakill whatever’s above them.)
5. Trapper (They are basically larger drones who carry web nets and throw them restrict the player’s speed.)
6. Workers (They gather for the colonies, and they only attack if you go near them or fire upon them, they are large and resistant to pistol fire, so it is advised to bring a Rifle of Shotgun to fight them)

Now on to what I’d need help with:
I’d probably need some designs for the bugs, and some backgrounds for the animation to take place in, maybe effects would be needed too but idk

Oh also here’s the M16 design, simplistic, but it sets a standard of simple but not too simple