When she attended as a guest on KAT-TUN's variety show, Cartoon KAT-TUN, she stated that she loved imitating her mother when she was young.
Her well-known commercials are her advertisements for Fujifilm (wherein she appeared alongside Japanese idol Nagase Tomoya) and Lotte (particularly for its sub-brands Ghana and Airs). Her current advertisements for the said chocolate brand are its Ice Yogurt and Shasha.
Horikita has appeared in numerous men's and teenage magazines, most of them featuring her on the cover.
Her exemplary portrayal in Nobuta wo Produce as the shy Nobuko Kotani, bagged her a Best Supporting Actress award in a Japanese award-giving body. On the other hand, the chemistry between her character, Nobuko, commonly known as Nobuta, and Kusano Akira, played by Japanese male idol Tomohisa Yamashita, was recognized as well, leading both of them to star in another drama, Kurosagi. Horikita bagged her second Best Supporting Actress award from the same award-giving body for her performance in this drama.
Come 2007, her role as Ashiya Mizuki in the Japanese adaptation of the gender-bender manga Hana-Kimi, or Hanazakari no Kimitachi e, earned her a Best Actress award, her first one to date. After filming the series, she has been attending press conferences for her three projects: the Taiga drama, Atsuhime; the suspense movie where she plays the lead character who has a multiple personality disorder, Tokyo Shōnen, and the sequel of her breakthrough movie, Always: Sunset on Third Street.
All her exceptional work paid off when Horikita was chosen by Vogue Nippon as one of its eleven Women of the Year (award) for 2007. Recipients of this same award include Ayase Haruka and Anna Tsuchiya.
On January 20,2008, she did a public 'after-recording' at a studio in Meguro, Tokyo for the Doraemon movie, along with other guest voice actors like Maria Genesis (GT). She already has done a voice recording for a video game series, Professor Layton series since 2006, but she said it's harder to get used to dubbing in the animation, than it is for the game. She was asked who, in the Doraemon series, is her favorite type of a boy. She replied that she has a lot in common with Nobita; a similar interest in sleeping, string figures, and shooting (as seen in western movies).
|2004||Sekai no Chuushin de Ai wo Sakebu|
|Shibuya Ghost Story|
|Shibuya Ghost Story 2|
|Ghost Story New Mimifcro|
|J-Horror Theater Prophecy|
|Always Sanchōme no Yūhi|
|Haru No Ibasho|
|2007||One Missed Call: Final|
|Always Zoku Sanchōme no Yūhi|
|Koisuru Nichiyoubi ~Watashi.Koishita|
|Nobita and the Green Giant Legend 2008|
|Keitai Deka Zenigata Mai||Zenigata Mai||Leading||2003||TBS|
|Doubutsu no Oisha-san||??||Supporting||2003||??|
|Division 1 - Stage 8 ("Houkago")||Michida Mayuko||Supporting||2004||Fuji TV|
|Kaidan Shin Mimibukuro||??||Supporting||2004||TBS|
|Ningen no Shoumei||Kouri Sayaka||Supporting||2004||Fuji TV|
|Densha Otoko||Yamada Aoi||Supporting||2005||Fuji TV|
|Nobuta. O Produce||Kotani Nobuko||Leading||2005||NTV|
|Tsubasa No Oreta Tenshitachi||Yuna/Komine Nanako||Leading||2006||Fuji TV|
|Densha Otoko DX~Saigo No Seizen||Yamada Aoi||Supporting||2006||Fuji TV|
|Teppan Shoujo Akane||Kagura Akane||Leading||2006||TBS|
|Seito Shokun!||Kimura Juria||Supporting||2007||TV Asahi|
|Hanazakari no Kimitachi e||Ashiya Mizuki||Leading||2007||Fuji TV|
|Deru Toko Demasho!||Kamei Shizuka||Leading||2007||Fuji TV|
|Koi no Karasawagi (Namaiki No Onna)||??||Leading||2007||NTV|
|Tokyo Daikushu||Sakuragi Haruko||Leading||2008||NTV|
|[Hana-Kimi>Hanazakari no Kimitachi e SP||Ashiya Mizuki||Leading||2008||Fuji TV|
|Innocent Love||Akiyama Kanon||Leading||2008||Fuji TV|