Neito is shown to be a calm, collected and intelligent young man. Among Class 1-B's students, he's the most fervent about wanting to topple Class 1-A's popularity.[2] He can also be disagreeable, sarcastic, and vocal when around the rivaling class.[3] He seems to be jealous of Class 1-A's popularity, but also worries that because they're always getting into trouble, they will also get the rest of the school in trouble, too. When he hears that Class 1-A fails in some way, he will usually laugh out loud and passive-aggressively ask how it's possible for them to fail since they are meant to be the superior class. Most of the time when this happens, Itsuka Kendo manages to restrain Neito before he gets too out of hand, apologizing on his behalf to whoever he was insulting, but on one occasion, when she was absent, Yosetsu Awasetook up her role.

Neito is shown to have something of a superiority complex, as he takes whatever opportunities he can get to mock and challenge, one up and surpass anyone in Class 1-A. This even extends to mocking himself in order to mock the students in 1-A, like when he teases the five of them who had to take remedial lessons during the Forest Training Camp Arc, saying it's weird that so many of them failed, as he's only person present from Class 1-B. He's been quoted by people as being mentally unstable, but this is more than likely a joke regarding his obsession with overtaking Class 1-A.

In spite of his bitterness and overconfidence, he does seem to feel somewhat threatened and intimidated by Class 1-A because of their skills and strength, this being shown when he sighs in relief after learning that he doesn't have to face them in the provisional license exam. He does switch back to his usual disdainful outlook straight afterwards, but he is possibly using this as something of a cover-up for revealing his true emotions.

Even though he puts on a narcissistic and disdainful front, it does seem like his outbursts are simply desperate attempts to cheer himself and his class up. In his backstory, it’s noted that he had a hard time justifying his goal to become a Pro Hero because of the Quirk he possesses, and because of this he thinks he can never be the “main character” in the story, instead being forced to take up the role of the “side character”.

Despite his scornful and competitive attitude towards Class 1-A, he has been shown to demonstrate compassion and understanding towards his fellow Class 1-B students. He tends to approach them with an encouraging attitude, and doesn't ever put them down, only giving them constructive criticism where it's needed, an example of this being when he tries to comfort Setsuna Tokage after her and her team's loss to Class 1-A in the Joint Training Arc. He also seems to be relatively confident in Class 1-B's abilities, and he is seen boasting about the Quirk of Kinoko Komori to the rivaling class, saying that they shouldn't have underestimated her and that she's one to be feared.

His manner of speaking is similar to that of Seiji Shishikura, as he frequently uses the -kun honorific, and tends to use more eloquent words than strictly necessary, especially when he's addressing the students of Class 1-A. This is seen most prominently in the Joint Training Arc.