How do get a dark magic character?

Easiest is Bellatrix and Voldemort:

Bellatrix LeStrange: In the last level, defeat her and it is a reward for defeating her

Voldemort: When in the LAST level when battling Nagini (The Giant Snake), go all the way to the back where the columns are, go behind the first one and his token pops up

You can get Tom Riddle in the 4th level of the last chapter (DH pt 2) In "Fiendfyre frenzy" at the last part of the level, use leviosa on a chest in the lower left corner to turn it into a mattress. Jump on this to receive the token. Riddle is also much cheaper than Bellatrix or Voldemort

Yes, he does. Unlike Lucuis Malfoy or Wormtail, he has The Killing curse. He also has a full spell wheel.

Bellatrix is the easiest to get and you should start saving for her as soon as you can

Some where in the astronomy tower (in the class section use diffindo on the door on the far right and then use hermiones bag to get the key) you can get both grinderwalds using only harry and hermoine and then purchase them for just a few thousand. They have all spells

The first one that is easiest to find is prob the bellatrixs (regular) and (azkaban)hope it helps

Which is the cheapest with dark magic?? I only have 2,019,390. Thankyou!!

Grindelwald (Young) is a dark wizard who's unlocked earlier than Tom Riddle in story mode I think ... Forgotten where I found him so wiki it.

Well you can get bellatrix lestrage by completing level 3(burning bridges) year 7 part 2 when you win the duel against her. You can get voldomort in year 7 part 2 final level. When voldomort is shooting spells at you go to the right side and you will see little nooks in the wall go in the one closet to you and his character token is In there. But they are both very expensive so search red brick codes and put in all the multiplier codes in weasly wizards wheezes and then turn them on in extras. When you get coins now they will multiply by 3000 and something

Voldemort: pillars in last level behind nagini first one got him yay

Belatrix: defeat her in burning bridges


BothSpoiler:

Enter fhsj44347 for dark magic

Try Draco he works for me he's easy to get and cheap 50,000 $ .

I got dolohov, not sure where but he can do dark magic and only cost 200,000 studs. I read somewhere that grindlewald old and young also work but not tried them yet, you get them in the divination classroom

Easy
In the last level, beat bellatrix to get her token