Steampunk Harley Quinn
Here she is surrounded by blueprints of destruction - a guide to the construction of her eh, toys.
Her trademark hammer is extendable and is fitted with a pneumatic extender that if triggered during a swing will pop out the back of the hammer at high speed, dramatically inceasing the power of the blow.
If you check out the blueprints you will also see the hammer in it's folded form, where it becomes a rocket launcher, the same mechanism being reversed to fire a fist shaped projectile from the front of the hammer.
Another blueprint describes the spring loaded mechanism on her vambraces that holds a small pistol at bay up her sleeve as it her until she flexes her wrist, releasing the spring and conveniently places the small single shot weapon in her hand.
Please see also Steampunk Batman [link]
And Steampunk Joker [link]
Hope you like.
Pen and Ink Coloured in Photoshop