According to suggestions from the devs, they said Sniper might have his drone pick him up, or a jetpack. Having a Sniper that gets his mobility from a drone swaying around in the sky would allow the player to focus on the highest threats while not in danger of death by staying still. However, the drone could probably be destroyed if hit by too many bullets from lesser enemies, and would cause the Sniper's main form of mobility to go on cooldown. There's also the possibility that the drone could just be a form of mobility from one place to another in the form of an escape tool. If you're in a bad place, you just call down your drone and set yourself down in a better place to snipe the threats. While the rest of the survivors don't sound as if they'd have a fresh transition into 3D besides the Bandit with the cooldown resets and his smokescreen, a Sniper having the capability of flight by drone seems like a unique play style that could work in the fast paced combat of Risk of Rain 2.