BlueStacks is the well known Android emulator which is used over one million users now a days and it’s numbering been increasing day by day.
Original BlueStacks installed (provided below)
BS Easy Toolkit (also provided below)
Unhide all hidden folder.
Launch "BS Easy Toolkit" and click on "RegEdit" tab and set memory option as half of your installed memory in your PC or Laptop. Well, I set mine on 1024.
Click on "RootEZ" tab and click on "AutoDetect from Installed BlueStacks" and click on the following options given in the image.
Click on "Proceed" button and wait for a few seconds or may be more. After successful root, you will see the successful message on screen. You're now done and successfully rooted your BlueStacks!