Who knows Dark Magic

lego-harry-potter-years-5-7nintendo-ds

When playing Harry Potter Years 5-7, I noticed there are things only Wizards with Dark Magic can interact with. I figure these are things I will have to go back and do later, as right now I don't have anyone in my party that can use Dark Magic.

Which characters in the game use Dark Magic? Who is the first one I can unlock, so that I can go back and get whatever it is from these areas?

Best Answer

If the DS version is the same in this regard, it would be Bellatrix (see this question for location).