Walker Waddle Dee is a regular Waddle Dee piloting a small yellow mech. Bolts are visible on either side of the vehicle. The mech occasionally has a missile launcher attached to the back. Aerial units have a missile launcher, side-mounted fins, and a propeller attached to the underside rather than feet.
Walker Waddle Dee slowly walks back and forth. If its mech has a missile launcher, the enemy periodically stops to fire a missile forward. If Kirby attacks the enemy, its mech is destroyed, leaving the Waddle Dee defenseless. It then acts like a standard Waddle Dee.