He has long hair, that he wears in two ponytails. He has a small goatee and a tattoo under his right eye. He is fully armored and fights with a sword.
Na Ki tends to have a relaxed and controlled manner. Never showing much expression however always seems to be paying close attention to those around him. Thus most likely the reason why Kan Ki chose him to watch the Hi Shin Unit. When angry he could get scary.
Na Ki is first seen in the Kan Ki Army HQs at Kakumin.
Before the beginning of the Battle of Koku You Hill, Na Ki was seen manipulating Bi Hei into joining the Kanki Army by saying their will be woman waiting for him there. After that he was seen in the Hi Shin Unit HQs telling Shin that Kan Ki wants to set up an Exchange Program between the two forces to better understand each other. Naki told them that he will be accompanying them on the campaign and that he’s a 1000-Man Commander. When Shin offered to send En Naki told them Bihei already went.
Later that evening after the Hi Shin Unit failure on the first day he was pleasantly surprised at how Shin treated Ba'in when Ba'in threaten Shin with death and decapitation of his arm. When he saw Shin boldly state that he will kill Keisha he told Ba'in to tell the Boss that he will take the toll for the arm and how he was partly responsible since he was attached to them. Na Ki then told Ka Ryo Ten that base on today events that their opponents isn’t a easy target to deal with.
After seeing Shin power and how he rose his men morale after they were getting destroyed by Keisha’s men. Naki and his Clan delayed Keisha from leaving which allowed Shin and the Hi Shin Unit time to catch up. Later after seeing the duel between Shin and Keisha take too long he had Ro Bin make an escape path.
After seeing how inspiring Shin and Hi Shin Unit are, Na Ki requests a transfer to the Hi Shin Unit. When Kan Ki asked for a reason for leaving; Na Ki claims that eating without feeling guilty felt surprisingly good. Rai Do and other members of the Kanki Army didn’t like that answer so Naki and his Clan had to fight their way back to the Hi Shin Unit.
Naki was seen apparently feeling guilty for abandoning the Kan Ki Army as he watch them do battle.