I discovered, and become a huge fan of, Sherlock Holmes at an early age — somewhere in grade school. Too long ago to remember, so it feels like I’ve “always” been a fan. (Conversely, I can remember watching the first episode of Star Trek in 1966, so reading A.C. Doyle for the first time must be many years earlier.)
Per Doyle’s stories, Holmes has a well-defined center, but as adapted, extended, reimaged, even satirized, by others, his boundaries are extremely fuzzy [see The Real Sherlock Holmes].
There is even a Japanese anime version of Holmes: Case File nº221: Kabukicho.