Naoki is the Ultimate Samurai and the protagonist of the story. He’s more of a quiet, awkward boy around people he’s not familiar with, but will warm up to people and grow nicer over time. He’s most social towards close friends and his sister, Kannon, and is very polite towards everyone. He’s prone to help others in need, much like his sister. He tries his best to hide his true feelings about the people around him and attempts to keep problems involving his mental health and well being a secret.

Having a younger sister, Naoki can become very overprotective of her, more overprotective than Kannon is of him. He isn’t fond of people messing around with him, his sister or any of his close friends, and therefore will become aggressive towards people that do hurt them if needed. He’s not as quick to snap back at people as Kannon is, but packs a rather frightening punch when he does.

Naoki likes ramen just as much as his sister and will occasionally take her ramen to tease her. He also likes eating donuts, the colours green and blue, and wearing hoodies. Despite being taller than Kannon, he absolutely hates it when she calls him “small” and will tell her and other people who do to “shut up”.

Naoki’s voice is that within the baritone range. It’s not overwhelmingly deep and shouldn’t sound too scary unless angered.