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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For heavies: railgun ( would hit near instantly and would recharge ammo by default) Mortar launchers(not nube tubes, these things would fire in a high arc then back down, firing them indoors would do nothing but kill the user) Specials: smgs( high fire rate, low impact but overpenatrates by default, allowing for a good backup gun) Sonic blades(similar to the swords of crota but smaller, these would be backup tools for any situation but only useful at close range. They would not carry the tracking that blades/dancers have )