When I was a child in 2001ish me and my siblings had this book. Spider-Man: The Ultimate Guide by Tom DeFalco! I was around 13 when the book came out and I don’t think I cared about Spider-Man all that much back then (that would come in with Sam Raimi’s Spider-Man 2 in 2004) but I did read the book. I guess, looking back, that might well have been my very first introduction to Harry and I didn’t even realise.
Recently I found the book again and I thought I’d share the Harry pages with you. (You can actually buy the book second-hand on Amazon etc for surprisingly little, though!)
This is the “Peter’s Friends” section (the second page, the first page is mostly about Flash):
Harry also gets a write-up in the “Other Green Goblins” section:
And the events of Spectacular Spider-Man #200 get a two-page spread:
harryosborn.net 
Oh that’s where the “MJ broke up with Harry in the drug arc because he got too posessive” fanon came from. Almost word for word too.
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Heartbreaking 💔😠I remember a comic where Peter celebrated MJ’s birthday with her, and insome panels he thought she was throwing a lot, even when she had to deal with a druggadictic Harry during their relationship. And I was what??? But she dumped before he fell in drugs 😅 In fact breaking with MJ was one of the reasons he got adicted in first place!
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