Books -- yes, always

What do you need to write a book? Do you need to take lessons, be gifted, have the 'knack' of writing? Do you need to be full of stories?
Because, there is book and Book. One could just fill hundreds of pages with mere rubbish and publish it. That makes a book. But, what about a Book, a 'good' one?
Do you need a story? A plot? Good against Evil? A setting? (do not even mention the writting style...but the style is the matter with which the book shall be built...) 'Characters' ?
A Book should not be boring. Writers want to write books that are enjoyable, don't they?
Should a Book have a unity, a solid spine?

I have a...'character' (well, we should create another word for this). Yes. The setting is...everywhere. There isn't a plot, nor a story really. The hero is...hum...yes, he's kind enough to be good. But he's so frightening sometimes one could think he's the devil embodied. Neither good not evil. It's even so strange to picture him sitting on a bench, in the normal world, talking with someone.
He's more like a feather wandering on the wind. He's got no name, no history, no family, no home...just a lot of necklaces. And his damn wonderful stupidity.
And I promised I would write him into a book. I've tried, for 6 years now, to write the book. But...how does one write a book without a plot, a story? If I just put down what's in my head right now, I'd have the reader snoring in a matter of minutes!

But now I ponder. What if my...'character' is not made to be put into the frame of a plot and a story? Fitting him into a book is tricky enough, even without me tying to force a plot and a story on him!
Maybe I should just write, throw all caution in the ocean, and only then sew the pieces together.
What a messy book that's going to make! Just as messy and foggy as the...'character'!