Before we dive deep into mythology to answer this question, let us put light on Parshuram’s role in both Mahabahrata and Ramayana. Parshuram is the sixth avatar of lord Vishnu as per the holy books of India. Just like other mythological characters, Parshuram is considered immortal and is bound to exist in different ages to perform certain special tasks. He is a Brahmin as well as a warrior. This blend of both the traits of a warrior and one of the most sacred tribe, Brahmin make him a perfect guru for everybody.
Because of his mentorship qualities he comes in every age to give new direction to his followers so that they can follow the right path. In Mahabharata he served as a mentor to Bhishma, Karna and Drona. He is famous for his axe. There is a story behind his axe too. He was a worshipper of lord Shiva and took the training of warfare from him.
Nobody can forget the lie told by Karna to Parshuram in Mahabharata in order to get taught by him. Karna told a lie that he is a Brahmin, in order to learn the best warfare skills from him .But when Parshuram gets to know about the lie he cursed Karna to that he will lose all the skills learned by him, when he will need it the most. This in turn results ion the loss of Karna from Arjun in the Mahabharata battleground.
While many people know the fact that Parshuram existed in Mahabharata because of his prominent role which led to the loss of Arjun. As Parshuram was the great follower of Lord Shiva he was annoyed by the fact that Lord Shiva’s bow was broken. This is the reason why he challenged Rama for a fight. As Rama being an avatar of Lord Vishnu could not be defeated by Parshuram. When the four brothers including Rama came home after marrying with beautiful brides, Parshuram challenged Rama for a battle which Rama won.
So Parshuram, one of the immortal avatar of Lord Vishnu is bound to exist in every age to tech the skills that he has acquired from Lord Shiva, whenever required.
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Nameless Review: It was Lord Shiva. Hmm. That makes sense :p