According to Hindu mythology, Why we consider all immortals count only 8 with no female and few other characters not included? Did any Hindu scriptures mentioned the reasons, why?
I found an Article, it mention few other characters who are immortal in Hindu mythology but who do not make it to the list. For example, Muchukunda, the son of Mandhata, who slept so long in a cave after a war, that when he opened his eyes, his first glance was so fiery that it set aflame the man who had rudely interrupted his sleep. There is Kalyavana, destroyer of Mathura, enemy of Krishna. Or Jambavan, the bear who served in Ram’s army and helped in the rescue of Sita. Or Banasura, the father of Usha, who was defeated by Krishna, but blessed by Shiva.
If they are immortals why we aren't consider them in the list of immortals?