Butt Stallion
Her Royal Majesty Queen Butt Stallion, long may she rein, is a magical diamond binicorn (that means two horns, read a book).
She's the most smartest, prettiest, perfectest ruler that ever lived, overseeing the Wonderlands from her capital city of Brighthoof. Every few hundred years, her arch-nemesis the Dragon Lord rises once again to cover the world in darkness, but Butt Stallion (heh, but butt) always defeats him with the help of a Party of Heroes.