Shisui was a very humble and down-to-earth individual. He was never arrogant about his own talent or accomplishments, yet was not above telling others when they made mistakes. At the same time, he was open-minded, never stubbornly believing in one ideal solely and strove to see that unique nature of current situation before him. Shisui was also a deeply compassionate man, even to enemies. He is deeply in love with his best friend, Itachi Uchiha, and strives to look after him. 