I urgently have to write a character study of Raj. My main issue with Raj is that he too good to be true. I have not found his dark side yet. In Part 3 he is neglecting Lara and gets sucked into work. Maybe he has a workaholic tendency and like every man he cannot speak about his feelings. He pulled back like a snail when the going gets rough on an emotional level. He also is very weak towards his parents. He follows their wishes for a long time.
If Raj was played by a current Bollywood star I would suggest Ranbir Kapoor for this roie. Not sure if anyone else could fit this role.