Can we start calling Naraku a Dark Lord? I like to call him Dark Lord Naraku. He has all the signs of a Dark Lord, and has been the main villain for the whole series. Dispite being used by the Shikon Jewel. I mean Naraku is basically Rumiko Takahashi's most popular and iconic villains, and a foil to Inuyasha, basically Naraku and Inuyasha are polar opposites. For many years Naraku has been Inuyasha's archenemy and when you think about it Naraku/Onigumo has some similarities to Voldemort/Tom Riddle from Harry Potter. Plus don't forget Inuyasha finally killed Naraku.
So let us start addressing Naraku as Dark Lord Naraku.