Sawbot

Sawbots are close to VS because they do have a vertical spinning weapon.

But contrarly to vertical spinners or drums that features bars/discs/tribars, a sawbot's weapon is just (as the name implies) a saw or circular weapon attached to a motor.

Sawbots suck in Stock RA2, but they can be very efficient in DSL.

Ninja and BOT-204 are sawbots, but Ripblade isn't one because it has teeth on a disc, and this in both DSL and Stock.

Sawbots do generally less damage than vertical spinners and have generally weaker weapons, but they do regular damage and their weapons can't be blocked. Also, if he loses one of it's saws, a sawbot won't wobble like a normal VS would.