Be creative here there are no wrong ideas.
I would like the Spartan laser to be a weapon personally, just called something different "Charge Rifle" was a name I had in mind
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A flame thrower that uses tubes of propane witch means you have to reload it quite often. But you can find them with all different perks and burns. Like a arc thrower with faster reload Void thrower with that perk that makes it do more damage after each kill stuff like that I reckon that would be kinda cool Another idea a sniper rifle with a Millie gun chamber at the end. It does less damage than normal snipers but has low recoil and a kinda high rate of fire. After each bullet the chamber rotates ready to fire again and you can hold down the shoot button to make it shoot fast. 4 bullets per mag you gotta land 3 to kill another guardian or 2 headshots