Multiple reactions to Kurono were given by critics for anime, manga and other media. James Musgrove of
IGN found his anime rendition to have "all-too-human motivations" juxtaposed with an emergence of his "hidden good side" as the story progresses, and implied that he was an unconventional protagonist. He praised Chris Ayres's acting on Kurono, finding him one of the anime's best voice actors despite it being one of his early works. In the live-action review,
Otaku USA called the character an "uneven protagonist" similar to how Kurono is portrayed in the manga and praised his connections with Kato and Kishimoto. Despite criticizing his role, the site compared him with comic book character
Peter Parker as both had yet to develop themselves.
DVDTalk stated that while the character initially was introduced like a "jerk", he becomes more likable in the anime series as it progressed and liked his interactions with Kishimoto.
Anime News Network found Kurono a more-attractive character stating that he "may be one of the freshest and most interesting anime protagonists of the past few years" and that he becomes more interesting across the action scenes, making his relationship with Masaru Kato better received. The anime's exclusive last story arc was noted to make Kurono a more-appealing individual. Fandom Post noted the contrast between the pacifist Kato and the berserker Kurono as the latter does not care about killing enemy aliens and ends up going through an entertaining growth during the final arc where he rejects being forced to fight human beings. Mania Entertainment stated that Kurono has "halfway decent hero material wrapped up in a slimeball package" for how he manages to fight his enemies based on his own childhood when he was used to face multiple challenges. However, Mania still stated that his portrayal of sexual desires might scare young viewers. The character also received a large number of negative comments. AnimeFringe described Kurono as "the token angst-filled high school student" and criticized his focus on puberty, finding Masaru Kato much more likable due to their differences. In a following review, the site also criticized Kurono's concerns shown in the anime series to the point that the reviewers might lose interest in the series.
THEM Anime Reviews similarly found Kurono to be an unlikable character, described him as a "soulless monster" and went on to say "he's mean, extremely selfish, very cynical, and you almost get the feeling he's happy that way, or at least unapologetic. There is no fall from grace; he's already fallen, and has no desire to get back out." A noted example was his inaction when Kei Kishimoto is nearly violated by a gangster in contrast with Kato who tries to save her. Another review from the site noted that despite Kurono's
character arc across the series, his changes are brief and Kato was more likable. Anime News Network felt that while Kurono underwent multiple personality changes across the manga, the site stated Oku lacked the talent to make it appealing and heavily criticized his overshadowing relationships with secondary characters. Critics have also commented on Kurono's role across the live-action films. While noting that Kurono goes through a notable arc in the live-actions,
Hobby Consolas found Ninomiya's acting too forced and at the same time his appearance was noted to lack Kurono's physical traits. UK
Anime Network praised Kazunari Ninomiya's acting in the second live-action film which manages to make the character more appealing. While finding Kurono more likable than his manga persona based on his growth across the first film and his romantic relationship, Anime News Network stated that fans might miss his original character traits. However, for the second film, another writer for the site said he enjoyed Kurono's growth alongside his relationship with Tae.
Japanator agreed with his comments regarding Ninomiya's role due to the notable growth he makes while also finding the actor attractive.
Twitch Film stated that Ninomiya is a "standout" for the way he portrays Kurono's character development across the first film.
The Japan Times found the relationship between Kurono and Tae simple, referring to them as "a hero (Kei) saving his princess (Tae) from the dragon (the black-clads)." ==References==