Interpretation of a character is obviously in the eyes of the beholder. I fell in love with Daniel just by reading the transcripts at Gatenoise, sometime shortly after the eighth season finale aired. I started watching eps when I couldn't resist any longer, and then I fell in love with the rest of the team. Then I started reading fanfic, and I met lots and lots and lots of other Daniels and Sams and Jacks and Teal'cs – some easily recognizable, a few remarkably like the ones that I saw on the screen and that lived in my head, and many that I didn't know at all.
I'm not going to insist, or even suggest, that every fanfic author out there write their characters to fit my specifications (even if the thought of several thousand new gen teamy goodness stories is immensely attractive). I don't think even the Goa'uld are quite that arrogant! On the other hand, fanfic writers would be doing themselves a great service by making sure that the characters they write about are actually the characters that their readers want to read about – if nothing else, they'll have a lot more readers that way.
There's nothing wrong with fanon, as a concept. For the most part, most common fanon assumptions about Daniel are based on canon, or extrapolated from canon, or at least don't contradict canon. Others… aren't. And if the writer airily asserts, "Well, this is an AU/my personal universe/not really important to the story, so just go with the flow, okay?" – then I will wish the writer well, and go find an author who is actually writing about the Daniel Jackson I know and love.
Some fanon amuses me; some confuses me; and some really, really gets on my nerves. I'll tackle one per post, or possibly a few related ones at once, starting with a real fan-favorite.
( Daniel and Coffee! )
My personal fanon opinion? Daniel loves coffee and drinks it whenever he can; he certainly enjoys specialty coffees, but he's perfectly capable of getting along with Air Force-issue sludge if that's the only thing available.
"Anyway, I'm sorry, but that just happens to be how I feel about it. What do you think?"