My favourite author all around greatly depends on the genre. If anything it’s a three way tie between:
warrenellis - His comics, novels, blogging, and commentary are perfect.
J. R. R. Tolkien - One of my first loves, fantasy, history, linguistics, his storytelling will forever hold a place in my heart.
Charles Bukowski - You were definitely on the right track. His raw cynicism, pessimistic hopefulness, depression, and love for alcohol, words, and women strike a horrible chord in me.