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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Also, they need to weaponize the ghosts. Fallen ghosts, servitors, have plasma bolts and a proximity discharge attack. Why can't ours have different light based attack or defense or buff options based on class, subclass and ghost shell? How awesome would it be to deploy your ghost like a turret in BL2 or have it deploy and start buffing your stats or repelling melee attackers or throwing off light novas that cause aoe damage or even deploying a shield like a cross between a titan bubble and a phalanx shield. Make this thing useful in combat or give us a combat drone we can upgrade.