Half-Orc Druid from one of my more creative players.
One day, a pack of Orcs raided a small village. It was standard fare: Pillage, rape, and burn. Quite a few Orcs, however, were intrigued by a young, fair virgin in the village. Her beauty and kindness knew no bounds to these orcs, and they kidnapped her, intent on bringing her to the Chief as a prize.
The Chief instantly was captivated by her beauty. He brutally raped her in the Orc village in front of the entire tribe. Her purpose served, the tribe thought in time she would be killed or kicked out. It was not so.
The chief kept her, for he loved her. He took her as one of his wives, enraging the tribe for compromising the Sacred Blood of Ghramai, Orc Goddess.
Stockholm Syndrome caught up with them, and the woman fell in love with the Chief. She birthed him a son, Fangore, and the reluctant Orcs were forced to accept him as their Prince, and this Woman as their future Queen.
The Chief taught his wife the ways of combat, for any ruler of the tribe may be challenged in mortal combat for chiefdom. She grew deadly, and many Orcs fell before her skill with blades.
The son, however, was raised as a black sheep. He was accepted only by the medicine woman, who took him in as a student in the Old Faith, where he learned how to interact with the spirits of the world and how Ghramai gave birth to all of them as their mother. Prince Fangore would become a shaman-in-training, adherent of the Old Faith, aspiring to lead his people away from the path of Evil.
The Orc Chief had died, and eventually, so did his Orc wives. Divine right to rule was passed to this human woman, as Orc Law only decrees that the Chiefs wives, unassuming of multiracial marriages, were to take the throne. Many Orcs were enraged at this motion, and sought to take chiefdom for themselves, but all fell to her blade. Thus she reigned as Queen of the Orcs, and she demanded more respect for her son, the Orc Prince.
There is a plot to kill the Queen, and if not her, the Prince. Fangore realizes this plot, but believes he must lead his people on the path of Good. He left the village to understand the Old Faith better, and to strengthen himself so that he may be ready to take the Orc throne.
This got major backstory-based sidequest, and there were many stories told by this half-orc Prince.