Sai is a major supporting character in Naruto and a member of Team Kakashi, later known as Team 7. He is a former Root ANBU operative trained to suppress emotion and follow orders without hesitation. Sai is skilled in ink-based jutsu, using his drawings as living weapons and tools in battle and reconnaissance. Over time, he learns to understand friendship, trust, and personal identity, becoming a more open and compassionate ally to Naruto and his friends.