Sai is one of the heroes of the Konoha Bobobo-bo Bo-bobo.
When first introduced, Sai was distinguished by his total lack of emotion which he often masks with a false, cheerful, yet transparent façade. After much mental conditioning and training while in Root, Sai had suppressed almost all of his emotions, laying all of his loyalty to whoever commands him, and thus making it easier for him to accomplish dangerous, unpleasant, or unethical missions. Due to this training and his lack of social experience and personal initiative, Sai has great trouble in understanding how bonds between people can motivate others. He often showcases this confusion after thinking about why Naruto would go so far to save Sasuke, a traitor, even though Naruto had not been ordered to do so. Also his traitorous mission causes Gasser to distrust him, and hate him but when he betrays his teammates to eliminate Sasuke Uchiha.
Sai's social awkwardness tended to get people angry, because he would often speak without considering his words and their effects on people. This was due to his inability to realise the difference between a rude statement and a true statement. Sai had read somewhere in a book that giving somebody a nickname would bring you closer to that person and develop your friendship, this resulted in Sai hurting Sakura Haruno's feelings, because he called her ugly, stating the first true character trait that came to his mind. This also nearly led to enraging Chōji, while eating barbecue with Team Asuma and Team Kakashi he nearly called him "fatso". Luckily Naruto covered his mouth before he could finish.
Sai was here when they saw Naruto being late as they about to go to the Hokage's Mansion until two strangers came and knocks them out.
During the Wiggin Trio's Battle, Sai was not present at the time or place.