Nanashi

is a foreign swordsman who joined the Great Fight Festival for an unknown purpose.

Appearance
Nanashi has long, dark hair and eyes, with the former being kept in a simple ponytail that has a small section fall at the left side of his face. He wears a light, slightly wrinkled kosode with forearm-length sleeves, a patterned obi sash around his waist and a pair of dark hakama. At the left side of his waist is his katana tucked into the obi. He is also seen chewing on, what appears to be, a plant.

Personality
Little is known about Nanashi's personality. However, he is shown thus far to be a quiet man who seeks great challenges.

Great Fight Festival arc
After accepting the invitation to participate in the Great Fight Festival at Vaizel perpetrated by Gloxinia and Drole of the Ten Commandments, Nanashi entered the labyrinth where he encountered an Earth Crawler and killed it with relative ease, saving some few groups of knights who took notice of his attire foreign to them in Britannia.

Upon being asked by one of them of his identity, Nanashi simply answered that the challenge lies awaited for him before proceeding on the depths of the maze where he finally reached the finish line and met up with the rest of the several contestants who also arrived including the Seven Deadly Sins themselves.

Abilities and Equipment
Nanashi is an extremely skilled swordsman, bisecting an Earth Crawler despite the protective mucus on its skin with strict ease.

Arthur Pendragon
Nanashi had an odd friendship with King Arthur, the young ruler of Camelot whom he had met as his partner at the Great Fight Festival in Vaizel. While being indifferent to him despite the latter's attempts to befriend him, Nanashi tags along with Arthur to help defend Britannia from the Ten Commandments' onslaught, presumably to seek a much greater challenge from fighting the Demons.

Trivia

 * Nanashi is a foreigner outside of Britannia despite some samurai elements like Simon of Dawn Roar in the King Arthur-based manga series.