Colleen’s answer to “Hello! I'm huge fan of your books (I reread Tigers saga six times) and I'm wondering which actors w…” > Likes and Comments

Here are a few suggestions. I think that these characters look the park, but, like you've said before, it depends on if they can act the part.
Sidharth Malhotra - Ren
Karan Wahi - Kishan
Cristine Prosperi - Kelsey
Adil Hussain - Mr. Kadam
Freida Pinto - Nilimia
Good Luck with the movie! Can't wait to see how it turns out!