At 19, the person would be considered a man and he can marry at that age.
If he has parental consent, yes.
Yes he can marry with 19 year old Nepali girl and after this she can also get citizenship of india.
No.
No, both are adults and do as they wish.
ok
With parents permission but seriously too young
It is legal to marry first cousin in India. http://lawcommissionofindia.nic.in/reports/report212.pdf - Page 19
The duration of Please Marry My Boy is 3600.0 seconds.
No, because she is too young to make a decision that important.
Please Marry My Boy was created on 2012-01-30.
Erh... don't you have to be 18 to marry?
Yes, a Muslim girl has to marry only a Muslim boy. She is not allowed to marry a non-Muslim boy. Refer to question below for more details.