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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Shotguns would be nice. Not sure what the pos blunderbuss thing they have in the game now is supposed to be but it's not a shotgun. They should replace the ultra-short range blunderbuss they have now with a pdw like a Steyr tmp or an hk mp7 or mp5k. Then they can add actual shotguns to the game. Mostly though, mostly they need a bow for hunters, crossbow for warlocks and a javelin for titans.