Thinking of putting letters never mailed into a book

While going through some old notebooks and journals a while back looking for some poems for a book I was doing, I found some unfinished fan letters I had forgoten about.
I was thinking of self publishing a book with the fan letters along with some doodles of the stick man I had done while I was still in high school.
I am not sure if the stick man is copyright protected or not. But even though they are in the likeness of the Ozzy stick man, they are my take on the stick man.
Any thoughts of ideas on how to use my drawings without infringing on copyright of them if they are protected?
I know it might take me a month or two to get the book together. I just don't want to piss Ozzy off if the stick men are copyrighted.
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