Riki's reflective nature makes him wonder what the 'secret of the world' is, and about the identity of the person writing the notes received by Rin. He is able, for instance, to appreciate the beauty of the poems shared with him by Mio Nishizono. Aside from his qualities of compassion, Riki is intelligent and reflective, capable of appreciating philosophical thoughts and considering questions of greater significance concerning the universe. Regardless, it is possible to suggest that due to his overwhelming popularity, Riki is the glue that nurtures and maintains the friendships forged within the Little Busters. Within the anime adaptation, Riki is portrayed as enjoying platonic relationships with each of them, although playing various characters' routes in the visual novels often inserts a romantic aspect to his relationships. It is for this reason that the Little Busters rally around him, leading Kyousuke to entrust him with the role of leading the group during the baseball match. Within the visual novel, Riki is able to uncover the stories of each of the girls he helps, earning the trust of and deepening personal bonds with each individual in the process. Showing great compassion and assisting individual classmates during their greatest times of need, the assembly of enough members for a baseball game may be attributed solely to Riki. Notably, whilst gathering members is initially the responsibility of all the childhood friends, only Riki truly succeeds in doing so. Although it is Kyousuke who is considered the 'leader' of the Little Busters - a figure who Riki has admired and looked up to since joining the group - it is Riki who is assigned to recruit members for the Little Busters' baseball team. What Riki lacks in physical strength, his compassion and generosity is able to compensate many times over.

He consistently holds above-average values on the attributes of concentration and judgment, testifying to his ability to consider situations calmly, from a logical perspective.

However, his fighting attributes increase on each replay of the game, eventually matching and outgrowing Kyousuke's statistics. In the visual novel, Riki begins as the weakest of the original five Little Busters members. Emerging from his depressive state, in the guise of 'preserving justice' and 'fighting the enemy', he befriended Rin, Kengo and Masato - the three other members of the Little Busters. Around that time, he was invited to be a member of the Little Busters by Kyousuke. Around the same time, he was diagnosed with narcolepsy, a disorder causing Riki to uncontrollably lose consciousness at random intervals. Riki's parents died when he was around ten years old, leaving him in a state of depression. Riki is also seen as the most dependable and reliable member of the group, as he is always willing to support his friends through personal difficulties, helping them face their personal demons. However, he is the only one who is straightforward, acting with the most consideration and common sense among his peers. He is the fifth member of the Little Busters, and of them, he is seen as the weakest due to his girlish appearance and fragile-looking body. Riki is the male protagonist of Little Busters!. Like Kyousuke and most other students, Riki wears a black, red-trimmed uniform coupled with a gold-trimmed, white-collared shirt and red tie. His eyes, gray-brown in colour, are comparatively larger compared to his male friends. His hair is straight and dark brown, hanging to the length of his ears. Riki has a weak physical build - compared to his childhood friends Kyousuke Natsume, Masato Inohara, and Kengo Miyazawa - and is seemingly shorter than many of the boys in his year.

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