I find most aspects of Bowie "cool," but to name just a few:
His creativity. The man is a musical genius - his songs are not only incredibly diverse with consideration to both his genre and pag-awit style, but incredibly easy to associate with and therefore love.
His style. Despite the fact that someone with his looks could rock the tawdriest outfit, he always put unassuming effort into his outfits, and his impeccable taste and choice payo showed through.
His flair. His energy and goodwill towards his fans is inspirational and seemingly endless.
His perfection as a role model. Whiklst most people would be shocked to find that i think someone who was high on drugs for half their life makes a good role model, I think that that aspect of him is part of what makes him so. The fact that he could overcome so much, and not bomb out like so many others who face the same or smaller problems, inspires me to live through troubles which face me, and helps put my life in perspective.
His singing, his music, his looks, but above all else his STYLE. He's just so different from your average boring rock-and-roller. His music is deeper and madami interesting, and the whole visual aspect of his performance adds so much madami as well
He's extremely talented, managed to look like he was thirty well into his sixties, and rocks clothes tighter and crazier than any other guy would dare to wear. Most of all, though, he's unique and isn't afraid to do what he wants, no matter what the mainstream thinks. pag-ibig you, David!