| 志熊 理科|
|School||St. Chronica's Academy|
|Novel Debut||Volume 2, Chapter 3|
|Manga Debut||Chapter 13|
|Anime Debut|| Episode 1 (Cameo)
Episode 4 (Official Debut)
Rika seems to have been greatly attracted to Kodaka since the day he "saved" her from a lab accident. Rika constantly asks to return the favor by giving her virginity to Kodaka, something that Kodaka objects to. She is the only one that likes Kodaka openly (although due to Kodaka's "density", he doesn't notice this, or at least pretends to), and despite claims of being physically attracted to Kodaka, Rika is quite obviously interested in him romantically.
Although Kodaka strongly opposes Rika's harassment and her attitude in general, he finds her quite cute, outside of her perverted nature, telling her (accidentally) that she is "right in his strike zone". However, whenever Kodaka praises Rika ever so slightly, Rika instantly reverts to her perverseness which often forces Kodaka to whine about her personality and makes Rika depressed.
Ironically, only Rika truly understands what Kodaka wants, along with the situation that is happening. When she confronts Kodaka with this, Kodaka feigned ignorance as Rika soon respects that and decided to be Kodaka's first friend in high school. Conversely, of all the neighbor's club members, Kodaka is the only one who notices the hard work Rika has put in behind the scenes to make the neighbor's club more enjoyable for everyone.
Rika's attitude toward Yozora can be expressed as respectful as she addresses her as "senpai" and tends to be quite polite when Yozora demonstrates her ignorance in varying topics that concern manga, anime and games. Despite different interests, they often team up to trick and bully Maria and Sena, which proves that they have many mutual traits. Rika also seems to understand this and tries to slowly turn Yozora into a soul mate with similar tastes, "comrade." For example she introduced her to "Homoge club" anime, and after successful introduction was aloud, thinking which anime she should pick next not to frighten off Yozora. Yozora initially insulted Rika on her perversions but Rika soon returned it by confirming Yozora's insults and even added more perverted comments back to Yozora. Being unable to handle this, Yozora soon stopped insulting Rika and would even do what Rika told her to do.
Although Rika was perverted, at times she would be shocked and surprised to know that Sena could be even more perverted than her. Rika also seems to have a complex (like most of the girls) towards Sena's buxom body, and would then insult Sena the same way as Yozora. Like Sena, if someone mocks or made a fool of themselves on one of Rika's favorite (BL) games, Rika would also become angry.
Although both characters do not really interact much, there was a time when Kobato became scared of Rika when the latter wants to know what color her undergarments are. It was eventually changed to more mutual terms as the series progressed.
Rika was the one who convinced Yukimura that she is a female. Like Kodaka, Rika respects Yukimura's decision of wanting to be a man and hence, has decided to refer to Yukimura as a guy, even after the revelation of her true gender.
Rika almost never interacts with Maria except for when she is angered. In this situation, Rika follows the antics of Yozora and begins to trick and mess with Maria. Other times, Rika seems to treat Maria fairly normal.