Koji Kashin

is an "Inner" from the organisation Kara.

Personality
Kashin is a straightforward and no-nonsense individual. While seemingly loyal to Kara, he apparently operates under his own views as he was willing to assassinate a fellow colleague. He also appears to have an interest in Boruto Uzumaki.

Appearance
Kashin is a tall man with long white hair which he keeps in a topknot, allowing some to fall to his shoulders, along with a trimmed beard along his jawline. He also noticeably wears a mask which conceals the top-half of his face, along with the black hooded-robe which seems standard of Kara.

Abilities
From what has been seen of him, Kashin seems to be a powerful individual. He showed noticeable stealth skill, being able to sneak up on the experienced elder in his team unnoticed, albeit he did suggest that he was losing his edge in old age. He is also a powerful Fire Release user, able to completely incinerate an individual, supposedly overcoming a target's regeneration capabilities.

Ao Arc
Upon their organisation losing their vessel, Kashin discusses the matter with the other members of Kara. Immediately after their meeting, Kashin approaches the elderly man of their group to assassinate, and mocks him for not noticing his presence. After impaling him with a kunai, Kashin incinerates the man, before thinking about Konohagakure.

He later speaks to Ao on a train and instructs him to retrieve the vessel that Kara lost, leaving him with a case filled with the needed information and weapons to carry out his mission.

Trivia

 * Kashin Koji shares his name with a folkloric magician believed to have lived in the late Muromachi period, though his historicity is debated. He is often depicted as a white-haired, bearded, elderly man in robes, and is said to have used his illusions to deceive and defraud prominent rulers such as Oda Nobunaga.