Mahajanas

 Mahajanas are the twelve delegated agents of the lord vishnu who have the duty to bring to the people the message to follow the path of devotional service. The word means "great persons", and was also used for administrators or officials of the  rulers.

^{Bhagavad purana]} (6.3.20-21) lists twelve Mahajanas, biggest devotees of God vishnu and knowers of Bhagavata-dharma. They are Lord Brahma, Narada, Shiva, the four kumaras, Kapila— the son of Devahuti, Svayambuha Manu, Prahalada, janaka, Bhisma, Bali,  Suka and Yama.

Madhu ( मधु, madhu) and Kaitabha ( कैटभ, kaiṭabha) are two daityas in Hindu scriptures and are associated with Hindu religious cosmology. They both originated from the earwax in God Vishnu's ears while he was in the meditative deep sleep state of Yoganidra, From his navel, a lotus sprouted on which Brahma, the creator, was found sitting and contemplating the creation of the cosmos.

BHAGAVATA PURANA states that during the creation, the demons Madhu and Kaitabha stole the Vedas from Brahma and deposited them deep inside the waters of the primeval ocean. Vishnu, in his manifestation as Hayagriva, killed them, and retrieved the Vedas. The bodies of Madhu and Kaitabha disintegrated into 2 times 6 — which is twelve pieces (two heads, two torsos, four arms and four legs). These are considered to represent the twelve seismic plates of the Earth.

According to another legend, Madhu and Kaitabha were two demons who had become powerful enough to annihilate Brahma. However, Brahma spotted them and beseeched goddess Mahamaya for help. At this point, Vishnu awoke and the two conspiring demons were killed. This led to Vishnu being called Madhusudana the killer of Madhu, and Mahamaya came to be known as Kaitaba

According to Devi bhagvad purana Madhu and Kaitabha originated from Lord Vishnu's earwax and performed a long period of tapas devoted to goddess Mahadevi The goddess granted them the boons of invincibility and voluntary death. The pride-filled demons then started attacking Brahma. Brahma sought Vishnu's help but was unable to awaken Vishnu who was still in deep meditative sleep. Brahma then prayed to Mahadevi and she helped awaken Vishnu. The two demons then fought against Vishnu and was undefeated. Upon advice from Mahadevi, Vishnu employs a trick to destroy the two demons. Vishnu praises the battle powers of the two demons and says that he is pleased to grant them boons. The boastful demons, proud of their victories against Vishnu, say that they are willing to grant him boons instead. Vishnu cleverly asks Madhu and Kaitabha for their lives and they are forced to kill each other.

The Kumaras are four sages (rishis) from the Puranic texts who roam the universe as children, generally named Sanaka kumara, Sanatana kumara, Sanandana kumara and Sanat kumara. They are described as the first mind-born creations and sons of the creator-god Brahma, Born from Brahma's mind, the four Kumaras undertook lifelong vows of celibacy  against the wishes of their father. They are said to wander throughout the materialistic and spiritualistic universe without any desire but with purpose to teach. All four brothers studied Vedas from their childhood, and always travelled together.

The Bhagvad purana lists the Kumaras among the twelve Mahajanas (great devotees ) who although being eternally liberated souls from birth, still became attracted to the devotional service of  Vishnu from their already enlightened state, they play a significant role in a number of Hindu spiritual traditions, especially those associated with the worship of Vishnu and his avatar Krishna, sometimes even in traditions related to Lord Shiva.

Yajna (: यज्ञ, yajña) or Yajneshwara ("Lord of Yajna") is mentioned as an avataraof the Hindu god Vishnu in the Bhagavad purana As Yajna, Vishnu is the embodiment of the Hindu sacrifice ritual or Yagna. He was also Indra(king of the gods) of the Svayambhuva Manvantara, the era of Svayambu Manu His father rushi; mother Aguthi.