Everyone's Named Henry or John

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Across
  1. 3. Sixth US president
  2. 5. The last American vampire
  3. 7. Aka Edward Hyde
  4. 10. DC occult detective
  5. 12. That guy from Game of Thrones
  6. 13. Tried to find the Northeast Passage
  7. 16. The guy who shot Lincoln
Down
  1. 1. Second US president
  2. 2. Had a very large signature
  3. 4. Victor Frankenstein's BFF
  4. 6. A doctor who runs an asylum in Dracula
  5. 8. imagine all the peopleeeee
  6. 9. Oscar Wilde's bitchy self-insert
  7. 11. Directed The Nightmare Before Christmas
  8. 13. Solicitor who visits Castle Dracula
  9. 14. Co-founder of Freddy Fazbear's Pizzeria
  10. 15. Sherlock Holmes's buddy