Merlin knelt beside Arthur's cold body, cursing the demon who killed the beloved king. In a fit of rage he trapped the demon inside a talisman, but knew the fiend wouldn't be trapped forever. He watched over Excalibur, waiting for his beloved Arthur to be reincarnated and return to him.
(your character) always knew he was different, but he could never put his finger on why. All he knew was he loved Medieval fantasy stories, and sometimes odd things happen around him. He also has a strange attraction to the eccentric owner of his favorite book shop, that always seems to be staring at him.