Jiwu

Jiu is an adventurer and the fourth member that joined Masayuki's party. She is a high level spirit magician.

Background
She came to Masayuki's party to check out on them after hearing rumors about them. Initially Jiu called Masayuki a scumbag that waved around the name of “Chosen Hero”, but for some reason Jiu began to worship Masayuki over time.

It is later revealed in LN Vol 13 that she is a member of the 'Single Digits', a top ranking individual within the Imperial Emperor's Order of the Near Guard, a 100 strong force in direct service to the Imperial Emperor Rudra Nam Ul Nasca.

Abilities and Gear
Jiu is a proficient spirit magic user. She could also use some healing magic, making her a very useful support in the team.

When revealed to be a member of the Single Digits, her dons a black colour armour with a sheen floating above on her body and is estimated to be a legendary grade with a performance very close to mythical grade, and is presumable the same to be with her black blade. She is good at attacking her opponent's key points and breakthroughs, good at evading and sets up barriers to protect herself. She is also shown to be cautious during fights.

She has an unknown Ultimate gift as a member of the Single Digit which specialises in having an absolute advantage for magic and exclusive skills, and it can also completely hide its own abilities from others. This also allows her to be a skilled assassin capable of evading even Rimuru when he was high alert.