Reply #16: All due respect, but in this case you should ask actors [View All]

[Bluenorthwest]

In general, actors really hate being called by the names of their most famous characters. To be polite, I would refer to this man as Kal Penn, the name which is his own, and also the brand of his stock in trade.
The OP did use quote marks around the character name, and considering the article goes into detail about his actual name, I don't see this as off the mark of that which is proper. The OP did use the quote marks and all. That is plenty.
But in general, Indian, British, American or Argentinian, actors really, really want you to use their own name when refering to them. There are some who will be very clear about that, to put it mildly. It is a frequent interview rider, for example.