Shihai Kuroiro/Relationships

Fumikage Tokoyami
Upon their first interaction, it appears that Shihai seems to have a deep understanding of Fumikage's personality and powers, which causes him to declare rivalry on Fumikage. In addition, he notes that Fumikage's tendency of using dark concepts and penchant for dramatic speech is similar to his.

However, Shihai internally admits that this was just a psychological tactic to mislead Fumikage about his true intentions, which was targeting Yuga Aoyama. Despite this claim, it is later shown that the two have bonded during the aftermath of the Joint Training Arc.

Kinoko Komori
Shihai appears to have a small crush on Kinoko Komori, which was notable when he and Kinoko were teaming up during the Joint Training Battle. When interacting with Kinoko, Shihai becomes nervous to the point of stammering and avoiding eye contact, celebrating internally when she praised him for his tactics. Shihai also appears to get a bit jealous when Kinoko interacts with other boys, such as his friend Fumikage.