Bhagwan Parshuram cleaned up the un just kings who were destroying the Sanatan Dharma by destroying the Brahamanas, Guru Kul and Rishis !!  Bagawan Parasuram, who is the 6th Avatar of Vishnu Bhagawan restored Sanatan Dharma from Evil forces even after his whole family was attacked and killed !! 

Parashurama brought 64 brahmin families from north and settled them in Kerala to make up for the killing of evil kings.
He was born on Akshaya Thrithi which is why a fast is observed on that day
He took up arms to protect the Sages & Brahamanas and this way restoring Sanatan Dharma in purest form
Sahastrabahu: the evil king had insulted his family 21 times, thus the whole Evil Kshatriya rulers was destroyed by him 21 times. He had also killed Sahastrarjun due to him ill-treating Bramhanas, Rishis and killing them for fun. Also, his sons had done injustice to cows (kidnapping Kamadhenu’s daughter)
Leader of the biggest religious revelution of his era
His original name was ‘ramabhadra’ which changed to Parashuram because of having a parashu (axe)
He taught the world to never interfere in other’s fights without knowing the whole truth (behedding of mata Renuka)
He did severe penance to get Shivji as his teacher, and learned weaponry and fighting from him
The only weapons that can compare to his ‘parashu’ is Indra vajra or the three letha weapons (bramhastr, narayanastr, trishul)
He is one of the chiranjeevis who lives always protecting Sanatan Dharma
He punished anyone who was unjust
He was versed in the language of the birds / animals
He is known as the guru of shastrvidya
He gave Sri Krishna the sudharshan chakra
He started the Kavad yatra