He wears the standard Qin uniform along with a two-horned helmet. He has a serious look on his face and a goatee.
Rai Ki seems to be very serious, just like Mou Bu.
He fights in the battle as one of Mou Bu's top commanders, and is seen among the men witnessing the final moments of Ou Ki .
He participates in the banquet together with Mou Bi and Chou Shi. After finishing their drinks they leave.
When Mou Bu came to tell Mou Gou about Ren Pa being the general facing him of Wei, he was again with his master, discussing Mou Gou's past.
Rai Ki and Chou Shi were seen fighting against Kan Mei's vassal Bei Man in order to prevent his from aiding Kan Mei.
When Mou Bu Army is stationing in Kakuen border region, he and Chou Shi tell Mou Bu about his father's death.
Rai Ki is seen during the Battle at Gecchi Plains commanding the offensive of Mou Bu Army.
As an adjutant and a vassal to Mou Bu, Rai Ki shows to be a capable military commander.