This DLC Includes a new skin for all the following characters:

• Alchemist;
  
• Witch Doctor;
  
• Mercenary;
  
• Trickster;
  
• Dancer;
  
• Taoist;
  
• Stray Cat;
  
• Ronin.

FYI:

You need to own the Ronin first before you can use its skin