As per the great epic Ramayana, Nishadraja was the king of the forest tribes, and he was the childhood friend of Lord Rama. His kingdom was situated in the outskirts of Ayodhya, and he was an able ruler. He used to play with Lord Rama during his childhood, and Rama considered him as his own brother.
When Nishadraja was married at his teenage, it was Lord Rama who was present at the marriage and offered lot of gifts to the young couple. When Rama left Ayodhya, during his exile term, it was Nishadraja, who met him at the border of Ayodhya, and gave him lot of fruits, honey and greens to his friend, and asked him to spend his exile term safely in the forest.
Similar to Guha, he has also showered his sincere love and affection on Lord Rama, and he spent his time, by always thinking about the welfare of Lord Rama. He also consoled Rama when Ma Sita was kidnapped by Ravana, and gave various powerful weapons to him.
Lord Rama showered his kindness on everybody, like the bird king Jatayu, Guha, Nishadraja, irrespective of their caste, creed and gender. He is the divine avatar, who has also granted salvation to Jatayu, Guha and to Nishadraja.
In his previous birth, Nishadraja was living in the Swarga Loka. Once he didn’t respect his master Lord Indra, even after seeing him. Due to that, he was cursed by Indra, to be born in the tribal community. However due to his past good deeds, he has become a friend of Lord Rama.
Nishadraja contains very good qualities like welcoming the guests in a proper manner, feeding them, respecting the elders and the sages, and helping them as much as possible. He appears dark in colour, looks very handsome, and contains a brave outlook. He had won his enemies through his bravery, and also due to his Rama Bhakti. He lived a long life, and after his death, he had relieved from his curse, and went to the abode of Lord Indra, the Swarga Loka.