More unique weapons.
Maybe a gun that shoots brahmin turds which could have a disorienting effect for a few seconds or turn them into gouls!
Maybe a gun that looks like a pimp cane and you can walk around with it, but it could also shoots shotguns shells.Saints Row 2
Maybe a Bow
Maybe a simple fork idk
Maybe a satellite in space that shoots a giant liberty prime laser that you acquire later in the game from NCR. You can summon it by laser targeting an object.
and so on.
Plasma and laser weapons could have different models than just that one model they had in Fo3.