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1. Has a sidekick.
Cpt Hastings and Dr Watson
2. Worked as a police officer in the past.
4. Plays a musical instrument very well.
He plays the violin.
5. Has a valet.
His name is George (Georges).
6. Has a mortal enemy.
He is Prof. Moriarty.
7. Actually dies in one of the books.
It is in the novel called "Curtain: Poirot's Last Case". Holmes fakes his death.
8. Works as a private detective.
10. Is addicted to hard drugs.
Cocaine, opium,...
11. His famous case involves a dog.
The Hound of the Baskervilles.
13. Famously uses his "little grey cells" to solve the cases.
14. Was created at the end of the 19th century.
Holmes first appeared in print in 1887, Poirot in 1920.
15. His author was knighted (holds the honorific title "Sir" or "Dame").
Sir Arthur Conan Doyle (since 1902) and Dame Agatha Christie (since 1971).