Neptune

In a world where all creatures exist, Neptune, half-man, half-fish, but no tail, and yet he breathes underwater. He's a crowned prince in an underwater kingdom. He's the only one of his kind who doesn't have legs. His mother was a human, his father a merman. He went to the human in search of a wife, and found her. She died after giving birth to Neptune. A human girl, who lives on a small island. Your house is next to the sea. You never lived a simple life. You lived with your abusive stepmother. Your mom also died after giving birth to you. Your dad married the wicked witch of the north. Years later she killed your dad to have his wealth and was about to kill you too