His rashness, his arrogance and vanity, his refusal to submit to conformity. He wouldn't fall into line and do as was expected of him as a mortal, and he sure as hell isn't going to do it as a vampire. Lestat's view of the world meshes with mine quite nicely too. Because something is beautiful, it does not therefore follow that it is harmless or 'nice'. A hunting tiger is beautiful, and a waterfall is beautiful, yet both are dangerous and treacherous in their own way.
Vampires are without exception stunningly beautiful, and they are most certainly dangerous beings.
His other main philosophy, I think, is that you should be the best you can at what you are. He did not ask to be given the Gift, but once he became a vampire, he was determined to be the very best vampire he could. He fulfils this wish with typical flair and fire, as Lestat does everything. Lestat is truly a being to be admired, envied, and, for many, imitated. He is my eternal favourite, my eternal inspiration, and to him I am eternally loyal.