 If you liked
Elfen Lied
|
 ...then you might like
Kasane
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I have found both Elfen Lied and Kasane to be very similar manga. Both of the mc's are seen as a freak of nature due to their deformities, and are both bullied as small children to the point of breaking. Kasane and Lucy each have their own powers, and use them to achieve their revenge.
If you like Elfen Lied, you'll like Kasane, and vice versa - they each are beautifully drawn and give the same feel, and are fantasy-tragedy-romance.