I have few assumptions about South India and I think all North Indian have same assumptions who haven't been in South India .
1 . FOOD
I think they eat idli sambar, dosa atleast once everyday .
2 . Education
They all are highly educated and well mannered .
3 . Names
All goons have name” Surya “
common natives have very long names like chinnapa, sonnapa, satyamurthi etc .
They have middle name ,this I learned through quota.
4 . Girls wear small black bindi on every dress .
That looks really very beautiful, unmarried north Indian girls don't wear bindi, I recently saw a video of two doctors dancing on Rasputin song, later I saw their interview in which girl was wearing a western dress still she was wearing a bindi and she was looking very beautiful.
5 . They eat rice on banana leaf 🍃 everyday.
6 . Rajnikant is their favorite hero like Amitabh Bachchan is favorite of almost every North Indian.
7 . They marry in the morning and on every special occasion they wear that special white silk screen with golden borders .
8 . Married or unmarried girls wear gajra of white flowers.
9 . Every house has a middle angan ( left space ) , they don't put many furniture in house .
10 . Common words
Aaiyaaai yoo ( aah )
Actually it means oh no .
illle( no)
rascala ( rascal)
machi ( best friend)
anna
( I use to think it means father but now I know it means brother )
pora
( I don't know but I have listened it many times)
Actually it is por just por and pronounced as pora , which means not enough in malyalam.
Kanna ( dear)