What is cast of Karan johar?

It seems you're asking about the "cast" of Karan Johar. However, "Karan Johar" is a person - a famous Indian filmmaker, producer, and director.

It's possible you're asking about the cast of one of his films. To help me understand, please tell me:

* Which movie are you interested in? (e.g., "Kuch Kuch Hota Hai," "Kabhi Khushi Kabhie Gham," "Ae Dil Hai Mushkil," etc.)

* Are you interested in a specific role? (e.g., the main lead, a supporting character, etc.)

Once I know which movie and role you are interested in, I can provide you with the cast information!