Which of the zodiac signs has a wicked heart?

aquarius.

A wicked heart is like a wicked soul. Why go there. All signs can be wicked or good. It depends on how you were brought up and your moral values.

None, their hearts are just misunderstood.
Like Elphaba.
If you feel like their heart is wicked, it may be just because they see the world differently than you. It's not a bad thing, but I would say the sign with the most wicked heart, to you, is also probably your least compatible sign because you just don't understand each other. And that's okay.

Scorpio and Capricorn.

Only in situaitions that bring out hostile passion my heart skips a beat in rage, then the stereos cranked up loud >:) http://www.youtube.com/watch?v=rVOi5Hdbd7Q&ob=av2e..which helps for relief... even a walk can feel like a "hug" on your overall mindset. Bringing it oxygen for energy to soak up toxic electrons thats left, which also stimulates protein keeping neutrons connecting.

Brain = Heart
Heart = Action