I was born on Nag Panchami. Being a Narcissist, I wanted to know the advantages one gets if born in Nag Panchami. What do the scriptures or astrology maintain on this?
Naga Panchami falls on the Sukla Paksha (the bright phase of moon) Panchami Tithi of the Shravana month.
So, we need to check the effects of getting born on the bright phase of moon as well as that of getting born on the Panchami Tithi.
Quoting from Astrojyoti.com:
459 – 461. Results of Fortnights: Now stated are effects of births in the two fortnights.
(a) Bright Lunar Half: According to Yavanas, one born in bright lunar half (Sukla Paksha) will be long-lived and will have sons. He will protect many people, be charitable, friendly, honourable, and dominated by his spouse.
(b) Dark Lunar Half: One born in or dark lunar half (Krishna Paksha) will be indolent, unclean, and jealous. He will blame others, will speak a villager’s language and will disregard all religions.
And, the effects of getting born on Panchami Tithi are given in the following verses:
Chaturthi: One born on Chaturthi (fourth lunar day) will be miserly, of tale-bearing disposition, fierce, adventurous, heroic, fickle-minded and crafty.
Panchami: One born on Panchami (fifth lunar day) will be honourable, long-lived, highly intelligent, stable minded, truthful and winner of senses, i.e. an ascetic.
The astrological text that the website is actually quoting from is Hora Ratnam by Bala Bhadra.
So, overall, from the perspective of Tithi and Paksha, it is a good day for getting born. But Tithi is only one of the five limbs (Panchangas) that shape a native's features with the other four being Vara (weekday), Nakshatra, Yoga and Karana. This has to be taken into account too.