Name that character!

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Across
  1. 2. King of depressing farewell letters
  2. 5. Sees nargles
  3. 6. True crime lover
  4. 8. Book series stealer
  5. 11. A very risky gamble
  6. 13. Coined the phrase "pinecone face"
  7. 15. Two sided triangles
  8. 17. Buzz cut club member
Down
  1. 1. Furry
  2. 3. Bookworm that packs a punch
  3. 4. Alicorn DNA
  4. 7. Chronic third wheeler
  5. 9. Goth cupcake diva
  6. 10. Has chapters dedicated to the fact that she has weak bones
  7. 12. Invisible diva and causer of buzz cut club
  8. 14. Buzz cut club starter
  9. 16. Top ten tragic deaths (rip)
  10. 18. ___ and key