Who is missing?

Theme round: Question 4

Many of you got the theme!

Cracked by: rohanquizzer, raklodramA, KK, Manish Achuth, badideabear, jowens, rickde, Mayukh Bose, Jayaprakash B R, Sumanth Patlolla, Logik, Vishnu Prashanth, Bharath, Ep, Gurupad, anurag, Rogi and Teju