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The Zodiac Competition: Scorpio
Hades
He had been the first child born of Kronos and Rhea. The oldest of the three brothers and he had been the one cast to rule over the Underworld without even having a seat in Olympus.
He was one of the Big Three and yet all his little nieces and nephews had chairs in Olympus. It had angered him at first but he had calmed down after he had come to the realization that he had an entire domain for himself. His brothers had to share, they were the ones that had to share the mortal realm and take either the sky or sea.
It was better this way. He did not have to interact with his two arrogant brothers. He was more powerful controlling death than he would have been had he been given the sea or air. Death was natural of course, but that did not mean that people could not be taken too early or allowed to live for longer than they were supposed to.
He had his own Olympus after all. It had only needed a couple of visits to Olympus during the Winter Solstice to get the plan of the entire place. One he had the plan, he had found that the entire structure was lacking and had improved on it so that the outside still looked similar but the inside was even better than the one in Olympus. Even Persephone had been reluctantly surprised when it had been completed. He had ordered her not to say a word about his palace to the Olympians. She had no choice but to agree.
It had been a move of pure revenge that he had made sure that all the demigods died young and never lived to an old age. Since he had not been allowed to have children, it wasn't any of his children that were dying.
He knew he wasn't charismatic, Persephone reminded him of that on a near constant basis. He had been cunning enough to trick her into marrying him. He knew that she hated it in the Underworld but he was sure she could find it much more pleasant than she had thought if she had actually bothered to try. She had had a preconceived notion of what the Underworld was 'supposed' to look like that she had probably received from the other Olympians and only saw what she had expected to see and nothing more. He knew that most of the Olympians had never even been in the Underworld.
He honestly had grown to like the darkness over the intensity of light. The darkness that was death was much more powerful and less likely to be resisted if it was calm and peaceful instead of being focused and intense.
Admittedly, you could always hear the screams of those tortured over the entire Underworld unless you didn't want to hear it. Hades sometimes found himself fond of the screams of the souls of people who had been truly horrible as those people really deserved what they got especially after he had loosened the requirements only a couple of centuries previous.