Parashurama
Hindus believe that Lord Vishnu has many important Avatars. Parashurama, also known as Parashuram Avatar, was the sixth important avatar of Lord Vishnu.  In this avatar, Lord Vishnu was in the form of a human.  He came to Earth to stop Chakravarti Samrat Karthaveerya Arjuna for he had become evil due to his ego and non humility, and as he was very powerful and had the boon of being the embodiment of the Sudarshan Chakra, the gods weren't able to defeat him and all the kshatriyas had become evil under him. Parashurama was the son of sage Jamadagni, one of the Saptarishis (or Saptarshis) and a sage who was known for his temper. It is believed that Parashurama was Chiranjeevi, meaning he was immortal. He was a great devotee of Lord Shiva. Parshurama's mother, Renuka Devi was born of a Kshatriya but she became a Brahmin afterwards (this was before the castes or varna were decided by birth).