There were some Rakshasas like Vibhishana who were noble. Were there any Asuras/Rakshasas who were initially evil but eventually became good i.e moved to the side of Dharma?
Asuras/Rakshasas/Daityas/Danavas who were initially evil but eventually became good i.e moved to the side of Dharma?
- Hidimva or Hidimbi or Hidimbā
She is mentioned as the female cannibal in The Mahabharata, Book 1: Adi Parva: Hidimva-vadha Parva: Section CLIV.
But after marrying Bhima she became good. As per this wiki, currently there are a few temples dedicated to Hidimbā Devi.
Initially, Malyavan (Ravana's maternal grandfather's brother) was king of Lanka. He was not good to the deities, sages, and ascetics. When they complained about Malyavan and other Rakshas to Vishnu, Malyavan attacked on Devas with his brothers Mali and Sumali where Mali was killed by Vishnu and other two left Lanka and started living in Rasatala. Later on Kubera started living in Lanka till Ravana took it from him. -UTTARA KANDA of Valmiki Ramayana
But in Rama-Ravana war, Malyavan preaches Ravana. -Yuddha Kanda - Sarga 35 of Valmiki Ramayana
Bāṇāsura: Story is given in Śrīmad-Bhāgavatam (Bhāgavata Purāṇa) » Canto 10 .63
Mahishasura: In his another birth, Mahishasura worshipped Bhadrakali for attain salvation. Kalika Purana was mentioned that.
Asuras/Rakshasas/Daityas/Danavas who were of virtuous nature:
Shachi (queen of Indra), the daughter of Asura Pulaman (as per Mahabharata)
Bali Maharaj (as per most of the Puranas)
Prahlad (as per most of the Puranas)
Prahoti (as per Ramayana)
Vibhishana (as per Ramayana)
Vajrang, Diti's son and TARAKASUR's father (as per Shiva Purana)
Mandodari, daughter of Maya Danava (as per Ramayana)
Brahma then addressed Vibhishana, 'O my son, I am much pleased with thee! Ask any boon thou pleasest!' Thereupon, Vibhishana replied, 'Even in great danger, may I never swerve from the path of righteousness, and though ignorant, may I, O adorable Sire, be illumined with the light of divine knowledge!' And Brahma replied, 'O scourge of thy enemies, as thy soul inclines not to unrighteousness although born in the Rakshasa race, I grant thee immortality!'
Vibhishna asked Brahma that he should always be righteous and have the light of divine knowledge. Brahma was so pleased that in addition, he even bestowed immortality upon him.
The obvious interpretation of the Shiva Purana is Vajrāṅga is an Asura who stopped being evil on his own. However, technically the only verse he is referred to as an Asura could be interpreted as giving up his Asura form.
There are many. Some of them are as follows.:
Andhaka became Bhringi.
Banasura became a Shiva Gana though later slain by Goddess Kanya Kumari.
3 Sons of Yagna Varaha Vishnu viz Suvrtta, Kanaka, Ghora became 3 sacred fire after their death by Lord Sharabha.
Prahlada later slayed by Indra.
Ghatotkach died while saving the life if Arjuna from Karna.
Surapadma became the peacock of Lord Kartikeya.
Krauncha aka Mushakasura became the Mouse of Lord Ganesha.
And so on.
I hope this helps. Prd..
One must have more patience to hear the answer that follows:
BAD CANT ADVICE BAD
NEITHER ASURAAS NOR RAAKSHASAAS were/are good. They committed attrocities to such extent that they were driven away from Divine paths in Universe from ages.
Prahlaada or Vibheeshana or others were not ASURA janmaas but MAANAVA janmaas to give last chance to their relatives that "they cannot impact so many living beings on Earth just because they are powerful by unjust ways for which there were no competitors".
To warn Asura, there must be a Maanavas (from whom Manu Dharma originated) to understand Divine qualities & Demonaic bad deeds.