[6][7] He can show kindness and leadership with his party and with others, at times willingly helping out someone such as Aqua after one of the Demon King's generals made her sad[8] or Darkness with her familial affairs.

[11] Through flashbacks,[11] it is revealed that Kazuma became a shut in NEET after seeing his childhood friend who had promised to marry him riding on a senior boy's bike.

[12] Almost all of Kazuma's romantic knowledge comes from anime, visual novels and other entertainment materials, which made him pretty inept at responding to heartfelt feelings in the beginning.

[14] Regarding the romantic relationship between Kazuma and Megumin, author Natsume Akatsuki intentionally chose not to shine too much focus on it, wanting to write a proper comedy spin-off on the two.

[18] However due to his low-level class, Kazuma is prone to getting slain multiple times in combat against especially powerful opponents, prompting Aqua to revive him.

When fighting alone, he often uses underhanded tactics to compensate for his lack of raw power, such as creating earth and blowing it in the eyes of his enemies or using "Steal" as a distraction.

With the immense wealth that he gathers through the course of the series, he buys more expensive equipment such as high grade manatites to cast stronger spells.

[20] As a shut-in NEET who was heartbroken by his crush in middle school, Kazuma confined himself to his room playing video games and reading manga due to his lack of social confidence.

After discovering that due to a lack of personal skills, he could regain his levels quickly, he ventures to the hardest dungeon available with the assistance of Wiz and Vanir.

[28] Kazuma has generally received positive reception for his role in the story as a subversion of traditional Isekai cliches that were present at the time.

[29][30][31] This trait was emphasized in a review for the first season of the anime with Max Iorio noting the stark contrast of circumstances between many other isekai protagonists and Kazuma.

[32] Rebecca Silverman of Anime News Network gave similar praise, describing him as "the most laid-back hero to find himself plopped down in a fantasy setting".

[33] Further analysis of his unorthodox characterization was exhibited in a Comic Book Resources article with author Louis Kemner citing examples such as the pointlessness of his initial death, his relationship with Aqua, his constant strive for money, and the lack of any noble cause.

[37] Similar praise was directed at the high amount of screentime Kazuma received and his role in the film but with certain gags being criticized due to their nature.

[40] Similarly, Kazuma was praised by SD Pict for his character development, noting that he's gone a long way from a NEET to someone who's more outgoing and reliable.

[47] He has been frequently compared to Subaru Natsuki from Re:Zero − Starting Life in Another World due to their many similarities in terms of character and series premise.