Sai Inuzuka

is a shinobi from Konohagakure's Inuzuka Clan, being the clan's current leader. Sai is also the author's secondary main character with the current Fanon Canon Rebirth story. His canine partner is Kukomaru, who he treats more like a brother than anything.

Background
Sai is the first child of Kiba Inuzuka, and an unknown Konoha kunoichi. Born after the Fourth Great Shinobi War, Sai has seen the village pass through many hardships. These circumstances pushed Kiba to train Sai harder than what the young boy had planned for himself; first starting by giving him a new born Kukomaru. He would be taught the clan's most basic technique: Passing Fang, at which Sai and Kukomaru mastered quickly. Through those times, Sai and Kukomaru grew together as brothers, using each other's backs to lean on. At age six, Sai would enter the academy, meeting all of the academy's expectations, if not exceeding them.

Showing his worth in the academy, Kiba began to open up the pool of teaching for Sai and Kukomaru. However, while doing a small sparing session, Sai and Kukomaru had already displayed the ability to use the Fang Passing Fang. Sai explained that it didn't apply any level science to achieve, and that he had many more tricks up his sleep. Even within the village, the academy instructor gave him the name, Sai the Human Wolf, a name at which he cherishes the same as his brother, Kukomaru.

Personality
Sai is extremely reserved, but can also be explained to be "interesting". This is because he can adapt and play any role, that he is placed on without flaw. He also has a thing for giving out nick names, to anyone he that has some level of authority. Towards the current Hokage, he refers to her as Ultra Big Chested Hokage, and referred to Tsunade as Big Chested Hokage. He is also known for taunting his opponents, a strategy he uses the angry them, then trying to turn the battle in his favor.