Leonardo da Vinci , Class Name Caster is a Caster-class Servant of Chaldea Security Organization in the Grand Orders of Fate/Grand Order. She later contracts with Ritsuka Fujimaru. While a male normally, da Vinci says that the Mona Lisa represented the ideal beauty she pursued during her life, so she feels nothing wrong in having become that beauty itself stating that as culture has changed, "the desire to become a beautiful girl might one day become the norm", thus manifesting as her view of beauty to reach this desire. Rational, yet placid. However, at things that are very interesting to him/her, da Vinci will jump at it with sparkling eyes. A type of genius that accurately grasps one’s abilities. What he/she can do, and what he/she cannot do. What others can do, and what they cannot do. Basically, because he/she can grasp (calculate) and speculate/observe everything with merely a glance, he/she is always composed. The point is, one should be composed and without being any different than usual, even if one falls into a desperate situation with no escape, and it’s no good if one doesn’t be careful. For him/her, the “unexpected” doesn’t simply occur, and even if it does occur, he/she completely assesses with great interest that rare situation. Just because it is said that he/she puts on a face that grasps anything, one should not be restricted, nor is it good, to completely rely on her. The fact that her current self is in a young female body is something da Vinci is relatively unaware of. After taking a bath, he/she is the type to prowl around as she likes while naked. Regardless of whoever is around. Da Vinci admits she is a pervert and does not seem to hide this fact. After becoming a Servant of the protagonist, da Vinci considers the Master as a “pupil”, and she conducts herself as a “teacher”. If one would have to say it, they would say she is someone who has a familiarity similar to a “teacher who is close in age” to their pupil rather than someone who is a “great teacher”. While extremely intelligent, da Vinci is also humble and kind to those around her, though she is more than willing to boast of her greatness when reasonably allowed. She is able to handle grave matters like Mash's deteriorating conditions and the havoc caused by Solomon with a gentle but understanding attitude. However, da Vinci is not without her eccentricities. She seemingly possesses a great affection for birds and subjects related to them. For example, when creating a vehicle to cross the deserts in Jerusalem, she adds a multitude of wing designs found on many of her previous inventions and dubbed the vehicle the Ornithricopter. She also keeps a beautifully crafted mechanical bird perked on her shoulders at all times. Da Vinci has a penchant for eavesdropping, especially when Dr. Roman is talking. There is also her habit of putting on a pair of glasses when activating her Noble Phantasm.