• When arrested by the Inquisition in Venice in 1755 he insisted on donning his finest clothes before allowing himself to be led to jail.
• He was the only known person to ever successfully escape from the Inquisition's cells at the Doge's Palace.
• He disliked being told he was good looking.
• He 'had relations' with 122 women.
• He was extremely intelligent and could hold his end in conversations on a wide variety of topics with a wide variety of people (he had posed at various times as a doctor, an astrologer, and a magician.)
• He translated the Iliad into Italian.
• He wrote:
  • poetry in Latin and Greek.
  • 6 plays in French.
  • pamphlets on philosophical issues.
  • mathematical treatises
  • a prototfeminist essay
• He played violin.
• He worked as a spy for King Louis XV
• He won a pistol duel.
• He shot the wig off a doctor who was trying to forcibly bleed him while he was ill, and then cured himself in four days.

Adding more as I find them.