I’m wasting time at work, so I don’t have time to get into nitty gritty details atm.
These are some vague ideas I’d love to see some iteration of:
Laser Pulse Assault Rifle (bursts of 3 red laser ‘blasts’ at a time)
Had this idea it might be somewhat akin to the old Browning Automatic Rifle (BAR) in look: https://en.wikipedia.org/wiki/M1918_Browning_Automatic_Rifle
To keep it from being “Too Op,” I suggested 3-round burst instead of auto fire. Perhaps the first blast is always “pinpoint,” while the next two hit in random areas adjacent to your aiming point. I call this the “Star Wars Blaster Effect.”
And also envisioned rapid energy consumption aspect requires wearing an accompanying "laser energy backpack,’ which prevents you from using other backpack type equipment (jump pack, personal shield, ammo pack, Angel/Guard Dog drones, Resupply Pack for AT weapons, etc.).
Acid-Poison Paintball SMG
Fires small balls of acid-poison that explode and splatter in colorful, damage-over-time corrosive sprays on contact. I’m not sure if this would impact tank type enemies – perhaps the top-tier upgrade would add a DoT corrosive effect to heavy tanks, but would not make this an AT weapon per se.
High-Tech Bow (a la Marvel’s Hawkeye)
One-Handed Small Cross Bow (w/ Different Arrow Tip Types)
I haven’t thought through the bows. They might require some new type of damage, attacks or effects to justify them in Helldivers’ high-tech world.