Writer's Craft- symbolism

I think the greatest symbol that was took in place in the story was the Manta Diablo. Even though the Manta Diablo was a symbol of evil it was also a symbol of punishment. It was supposedly a god that lived in the sea. When ever someone said something bad about the Manta Diablo it was able to find out within seconds. Then he/she will be punished since he/she disrespected him. The Manta Diablo helped the main character become mature thru out the story. However the main character loses the people that are close to him and loses his father. But he learns that life is a cycle and matures thru the pain that he has gone thru. Manta Diablo is a symbol of punishment who ever does wrong towards no him but rather to other people. I think that is the greatest symbol that manta Diablo is. It is like a judge throughout the whole world in this book. It go seek justice that has to be done thru out the sea. The Manta Diablo balances out the world in the book to evil and good. In the book it says that the Manta Diablo is able to change its form to human, and kind of fish, and so many others. Therefore it is able to have so many forms.