Maui was born to an unnamed couple centuries before the events of the movie.
Disgusted and apparently wanting nothing to do with their son, Maui was thrown into the sea as an newborn and left for dead.
He was saved by the gods, who raised and granted Maui supernatural abilities, immortality, and a giant, magical fish hook that allows him to shape-shift. Despite his demigod status, Maui's cruel upbringing would forever scar him. He felt inadequate to humans and used his powers to benefit mankind in any way they pleased as a means to earn the love and validation he was denied by his parents; he pulled islands from the sea to provide them with homes, extended their days by pulling back the sun, and stole fire from the bottom of the earth to provide them with warmth on cold nights, among many feats. As a result, Maui became one of the most acclaimed figures of Oceania history.
Maui's need to satisfy mankind did not stop there, however. On one fateful day, Maui stole the heart of Te Fiti, the mother island. As the gem has the power to create life, Maui believed it would make the perfect gift to mortals all across the world. Unfortunately, once the heart was removed from its resting spot, darkness slowly began consuming the world. The removal of the heart also gave birth to the wrathful lava demon Te Kā, who confronted Maui before he could escape. The two battled, but Maui was defeated, losing both the heart of Te Fiti and his magical fish hook in the aftermath. The heart would remain lost for centuries, while Maui's fishhook eventually fell into the possessions of his arch-rival, the giant crab Tamatoa.
Maui, meanwhile, was banished to a desolate island by Te Kā and was doomed to remain there for all eternity as punishment for his crimes. Even so, legend proclaims that Maui is destined to team up with a young hero—the "chosen one"—to return the heart to its rightful place.
To be added.
Okay, okay I can see what's happening, yeah. You're face-to-face with greatness and it's strange. You don't even know how you feel. It's adorable! Well, it's nice to see that humans never change. Open your eyes, let's begin. Yes, it's really me, it's Maui! Breathe it in I know it's a lot, the hair, the bod. When you're staring at a demigod. What can I say except "You're welcome". For the tides, the sun, the sky. Hey, it's okay, it's okay, you're welcome I'm just an ordinary demi-guy! Hey, what has two thumbs and pulled up the sky. When you were waddling yay high? This guy! When the nights got cold, who stole you fire from down below? You're looking at him, yo! Oh, also I lasso'd the sun. You're welcome. To stretch your days and bring you fun. Also, I harnessed the breeze. You're welcome. To fill your sails and shake your trees. So what can I say except you're welcome? For the islands I pulled from the sea. There's no need to pray, it's okay, you're welcome I guess it's just my way of being me. You're welcome, you're welcome. Well, come to think of it. Kid, honestly I can go on and on I can explain every natural phenomenon. The tide, the grass, the ground. Oh, that was Maui just messing around I killed an eel, I buried its guts. Sprouted a tree, now you've got coconuts. What's the lesson? What is the takeaway? Don't mess with Maui when he's on the breakaway. And the tapestry here in my skin. Is a map of the victories I win. Look where I've been, I make everything happen. Look at that mean mini Maui just tippity tappin'. Well anyway, let me say you're welcome! For the wonderful world you know. Hey, it's okay, it's okay, you're welcome! Well, come to think of it, I gotta go. Hey, it's your day to say you're welcome! 'Cause I'm gonna need that boat. I'm sailing away, away, you're welcome! 'Cause Maui can do anything but float. You're welcome, you're welcome! And thank you!