Zenji is extremely intelligent and is one of the most academically gifted persons in his class. He is comically weak and is easily exhausted due to his low stamina. As a result, many of his classmates look down on him for his physical weakness. Zenji admits that not only is he physically weak, but also has no outstanding cooking talent compared to the likes of many of his other classmates. To make up for this weakness, Zenji devotes himself entirely to his academic studies so he can keep up with the natural geniuses and prodigies in his class. His natural intelligence and sharp memory are his assets that truly compensate for his physical shortcomings. Zenji does not like the fact that the Polar Star residents love to hang out in his room since it is the biggest, especially since he would rather be studying. Still, he eventually caves in more often than not and even participates in their shenanigans. Nevertheless, he cares a great deal for his fellow Polar Star friends and is particularly close to Shun Ibusaki.