As @Valorum pointed out in comments, there are lots of Indian characters in Marvel. Here's the list: http://marvel.wikia.com/wiki/Category:Indians
Also, worth pointing out: Indian gods Brahma, Vishnu, Mahesh (Shiva) and Indra have appeared in Marvel comics. Thor even defeated Shiva in Thor #301.
In another issue:
Note: Depictions of gods would look funny to someone who is familiar with those gods in modern Indian media (TV etc), but Marvel's version can't be wrong as they include all the signature features provided by religious texts viz. 4 heads of Bramha, 3 eyes of Shiva.
Update:
As I see you are looking for Indian "superheroes" in Marvel, here's the list:
Hindu Gods: Ganesha (Earth-41001; Earth-616), Lakshmi, Skanda
Triad Brothers: Jonathan Tremont, Lord Templar, Pagan
Omega Sentinel (Earth-12131; Earth-41001; Earth-616)
Dr. Kavita Rao (Earth-616; Earth-11326; Earth-TRN338)
Super Villains:
Vindaloo (Earth-2149; Earth-616)
Other super-powered individuals: