Rika Shiguma

Rika Shiguma is a main supporting character from the Boku wa Tomodachi ga Sukunai series, a freshman and scientific genius whose presence at St. Chronica's Academy was designed to increase its prestige. She was saved by Kodaka when she fell unconscious during a disastrous lab experiment (she invented and released sleeping gas that works in just a few seconds), and begs to repay his kindness with sex. She joined the Neighbor's Club just to get closer to him. She is the fifth member of the club. Rika was a shut-in before joining, being isolated from the outside world her personal room in the school, she prefers the life of a loner like Yozora and like her, is extremely anti-social.

As a fujoshi, she is a passionate consumer of BL dōjinshi and magazines, is comically aroused by intercourse between mecha, and is delighted when Yukimura offers to have sex with Kodaka. Although there are many adult themes in the series, she is the most sexually forward member. This was clearly highlighted in her first speaking appearance when she described the attractions of rape to Kodaka in the middle of a stunned class. She has a habit of inserting any sexual innuendo possible in her sentences, to the point where she finds it normal to convert every innocent thought into something perverted. Rika is proud of her pervertedness, as she says that she would be a boring person if people only thought of her as a genius girl. To compound her eccentricity, she speaks in the third person.

She also greatly enjoys BL-related media, mostly H-games and novels, to the point of watching one in front of everyone and fantasizing about Kodaka with Yukimura (before Yukimura was revealed to be female). Despite her perverseness, Rika is shown to be very caring towards her club-mates as she is very sensitive to everyone's well-being and is almost always depicted in high-spirits. She is quite pestered by the fact that her club-mates usually feign ignorance about their already-established friendship by claiming that they are still friendless and view each other only as club-mates, especially Kodaka.

Rika seems to delight in shocking others with her forwardness, especially the unflappable Kodaka. His casual manner of dismissing her advances becomes a major source of frustration for her, however. Throughout the series, he responds increasingly cooly to Rika's attempts to get his attention, to which she is visibly disappointed. While Rika enjoys shocking others she is easily overwhelmed when any sort of genuine affection is leveled at her, and usually blushes intensely when receiving it.

Despite her sporadic persona, Rika is perhaps the most dedicated member in terms of achieving the club’s intended goal to make friends. Unbeknownst to the other characters, except for Kodaka, she puts forth a tremendous amount of effort behind the scenes to make some club activities, such as the VR game and club film, an enjoyable experience for everyone.

In Volume 7, it was made clear that she's surprisingly the one who knows the most about Kodaka's feelings; seeing that he was just playing ignorant to their feelings despite fully well knowing them; as well as knowing his reasoning for doing so
In Volume 8, Rika agrees to be Kodaka's friend, making him the first friend she's ever got in her entire life.