I didn't see anyone else mention this yet, so I thought I would throw this out there.

I saw this in the halloween decoration section at Home Depot the other day and I thought to myself, that would sure make a nice companion sitting next to a WOZ pin.

http://www.homedepot.com/p/Gemmy-6-4-ft-Wicked-Witch-of-the-West-with-Broom-62376/205081153

It moves it's head and speaks and it even has a motion activated switch to trigger it, so I figure you could hook up the "activation switch" into the pinball machine and make it interactive. Such as hitting the witch target or maybe draining the ball.

It would also be a possibility to use it as a topper if you chop off just below the shoulders, the arms are movable, so you just have her arms/broom off to the side of the machine. Though this would require a good amount of ceiling space.