Nietzsche might very well have been one of us. Wittgenstein was unpredictable, rebellious, a risk-taker and had periods of depression. I'd say BPD-like.

Kant was a hermit (more or less) who had an irrational fear of sex and love and who had a very strict routine. He used sentences which even for German standards are circumstantial. He tried very hard to be and stay rational. It could be schizophrenia (or an autism spectrum disorder).