Hi Navin,
It's best if your friend can find an old school classic and convert that into a fixie, else, you can always buy a single speed mid range bike,
and then convert that as well, or, well the last option would be to import a mongoose or something like that.
The factors that go into riding a fixie, people tell me your mental to be firstly riding in BLR on a cycle, to top it all, they think your kukuu!, if your, riding a fixie, once they realize it has no breaks what so ever.
If your comfortable riding a fixie, it will have no implications. Just makes your a smarter and sharper rider with some insane lower body strength.
I converted my my 1979 10 speed gran touring motobeacan in to a fixie and rode it to work every day while I was in Bangalore. The guys at Cycling Boutique helped me figure it out. Fantastic job done by them.
My recommendation to your friend, first get a hand of a fixie n see if your friend is comfortable, and secondly safety first, ride with a helmet and brakes!
Peace,
Ben