Nanami is a tall, well-built man with blonde hair styled with a neat part. Nanami has very thin eyebrows as well as small eyes that are usually covered by his signature sunglasses, which don't have arms that wrap around the ears.
Befitting a former office worker, Nanami is usually fully dressed in a business suit. His usual suit consists of a blue dress shirt underneath a tan blazer with matching slacks and light shoes. Attached to his dress shirt, there is a holster that sheaths Nanami's blunt sword, hidden by the back of his blazer. He also sports a necktie that shares the same dotted pattern as the bandages around his blunt sword.
After graduating from Jujutsu High and working for corporate, Nanami wore a vertical striped jacket over a white button-down shirt and dark-colored tie with white dots all over it, vertical striped pants, and black shoes. As a student, Nanami wore a normal Jujutsu High uniform. His hair was styled slightly differently when he was younger.
Nanami is a very wise and reserved kind of man, often appearing so calm and indifferent that he comes off as stoic and aloof. He seems like the kind of person who's too serious about his work, but Nanami just knows how to separate sentimentalism from service. He's blunt and straight to the point in most conversations and doesn't care for impractical optimism or questions left open to interpretation.
Additionally, Nanami is very avid and quick to express his irritation, either on his face and verbally with his words. Nanami is often very impatient. He hates working overtime and is very serious about not going a single minute over what's required of him.
Beneath his tough exterior, Nanami is actually quite sociable and doesn't mind intelligent conversations. He's practical and overly serious to an almost comedic point on occasion as well. He claims he only became a jujutsu sorcerer because it's slightly less idiotic than being a salaryman. In the role of one of Yuji's mentors, Nanami is a very big contrast to Satoru, who is far more outspoken and easy-going. Yuji and Satoru describe Nanami as "gloomy" and the former didn't believe they would get along at first.
Nanami is just a normal man weighed down by the mundane day-to-day practices of life that stole his youth from him. Nanami doesn't believe age or life-threatening experience propels one into adulthood. Instead, he feels that it's the build-up of all the little inconveniences throughout life that transform people into adults. He initially treated Yuji as a child because he didn't want to see him abandon his youth for the sake of being a jujutsu sorcerer. However, Yuji eventually proved himself and forced Nanami to acknowledge him.
Nanami knows being a jujutsu sorcerer is a dangerous and demanding job for crazy people, and so he has a hard time respecting people in the profession. Even though Nanami and Satoru are longtime friends, the former claims he doesn't respect Satoru despite their mutual trust in one another. He returned to being a sorcerer from the life of a salaryman because he never felt truly appreciated and didn't believe his work had any significant impact on anyone. In contrast, work as a sorcerer allowed him to build up small bits of appreciation from innocent people. For Nanami, this was more than enough to allow him to live without regrets.
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Nanami had a similar yet naturally less mature personality while he was a student at Jujutsu High. He saw missions as a burden but his negativity was always offset by his classmate Yu Haibara's extreme optimism. Haibara's death affected Nanami greatly and likely played a role in his initial decision to leave life behind as a jujutsu sorcerer. One of the reasons he believes jujutsu sorcerers are trash is because they must force their comrades to accept that they must willingly sacrifice themselves. He recognizes that this lead him to "run away" from the profession, admitting that it's a more befitting phrase than suggesting he "quit". Nanami wants to believe he's never been frustrated by his own uselessness, but many of his failures haunt him, such as allowing Haibara to die.
