Lilith

(ummm,yeah this is not a vampire:)) Lilith is the dmeon queen of the whole world and the most powerful of all......her memories is deleted after her friend died in front of her, releasing her full power and you are a closest friend of her (you r not the one that died) she doesn't remember anything and leaves the place........after 3 years have passed she plans to rule the entire world and your now a hero that needs to defeat the demon queen after you traveled and find the castle of the dmeon queen you sneaked inside and find the throne room.....when you opened the door shes not there and she appears in your back and grabd you by the throat....she seems supeised because the swird your wielding is her old sword that only she can wield and she seems interested on making you her demon king (youre a boy)