2 - X Files :( Guessed. D0, since my opponent is good at TV and film.
3 - Elvis Presley :( Another guess I knew was wrong but figured it was better than putting nothing. D1
4 - ABC :( Of course, two hours after I submitted, I read an article about Roald Dahl's books being republished with two versions (original and more PC) that included PEN America quotes all over it. D2
5. Yin / yang :( I figured it was something more specific to personality types... D1
6. Mesopotamia :( Didn't know these regions at all. D3