Sa Ji had a rather tall build, and was cleanly shaved. Sa Ji was seen wearing robes even for the fight against Shin.
Sa Ji was very cruel and arrogant, he thought he was the strongest in the world because he had mastered the sword in both speed and strength. His men commented that he was the type to cut you in half if you got his clothes dirty. When he had the upper hand on someone he felt insulted him he took pleasure in slashing his opponent while constantly taunting them.
Sa Ji's first appears with Gi Kou and Shi Shi as they watch Ei Sei's group ride into Kanyou. We learn that he was highly ranked in the capital after he punches a Gendarmes and there was no retaliation.
After a tough battle, Shin was able to defeat Sa Ji in the final blows that they trade with each other.
Sa Ji according to the Gendarmes was a high ranking official in Qin as one of Ketsu Shi's trusted executioner. Who killed Ketsu Shi's enemies from Qin. Sa Ji is very strong as he easily killed two mountain men with one strike of his sword each, and he had a killing intent that even paralyzes Heki, a seasoned warrior.
- vs. Shin: lost