|Name in Japanese||リア・ハグリィ|
|Romaji Translation||Ria Hagurii|
|Debut (Anime)||Episode 15 (cameo)|
|Debut (Light Novel)||Ore no Imouto ga Konnani Kawaii Wake ga Nai Light Novel Volume 06|
|Appears in||Light Novel, Anime|
|Voice Actor (Japanese)||Ibuki Kido|
|Measurements||75 / 55 / 80 cm|
Ria Hagry ( リア・ハグリィ , Ria Haguri?）is a track and field athlete, also Kirino's rival. Kirino met her in America when Kirino was drafted by a famous track coach in episode 12 (True Route). When Kyousuke persuaded her to return to Japan in episode 15, Kirino said that she promised to beat the best runner before returning to Japan. She revealed to Kuroneko that certain runner was Ria Hagry.
Ria later went to Japan and stayed at the Kousaka residence on S2 episode 04. Ria is shown as an innocent energetic girl who doesn't need or care much about anything other than her hobby, running. Ria viewed Kyousuke and Kirino as if they were her bigger siblings, even calling Kyousuke "Onii-chan." Despite being a foreigner, she can speak Japanese. Ria toured Akihabara with Kirino and Kyousuke and later revealed that she came to Japan partly because she wanted to have a revenge match against Kirino, successfully outrunning Kirino again, and also partly to see what made Kirino run so fast the day that she beat her. She contributes to the plot by discovering in their rematch what she suspected and revealing it to Kyousuke: Kirino ran so fast because she was encouraged by her brother's presence. This was shown the day he came to get her from America, and again during the rematch.
Ria then, shortly after, departed back for America, her job fulfilled.