#NTRivikram is based on
#ShivaPurana &
#SkandaPurana where
#Karthikeya was born from pure
#Shiva's cosmic energy when it's being said that
He is born in the North
He is forged in the Heartland
He is worshipped in the South
Additionally used
#AdiShankaracharya's hymn also inclined towards the Puranas.
--‐------------------------------------------------------
Tamil people's version is not based on any Purana but based on
#EarlySangamLiterature &
#Tolkappiyam with
#Seyon being born as the RED ONE, the War LORD born to
#Korravai (Goddess of War)
May be Muruga settled in the Southern Bharat and Korravai adopted him as she is later described as
#Vishnu's sister possibly an incarnation of
#Parvathi Amma herself and then in the late Sangam period, they got access to the actual Puranas and then rewired his origin story to be be sync with the Puranas.