Surpisingly, the second-most-talked-about seiyuu is the beautiful Chihara Minori. This is a clear indication that singing is of tremendous interest, since those two are probably currently the two most popular singer-seiyuus. Nana-chan is definitely the most popular, especially since her appearance on a top mainstream Japanese music show.
Tamura Yukari, the long-time idol seiyuu who made her name as Nanoha and is now starring in the ecchi comedy B-gata H-kei, comes next. She is also a singer.
And then we have Hirano Aya, whose role as Suzumiya Haruhi propelled her to the top, and whose beauty and visibility may be helping to keep her there -- along with her own singing. She is also by far the most hated seiyuu on 2channel, with almost half as many threads of posts against her as normal threads. Each 2channel thread represents a thousand posts.
Then we get to a couple of seiyuus who don't do as much singing, but both of whom do moe roles: Asumi Kana, who plays Yuno in Hidamari Sketch and Poplar in Working; and Iguchi Yuka, who plays Index in To Aru Majutsu no Index and is one of the stars of the new ecchi comedy Mayoi Neko Overrun.
Here is a list of the top 50 threads on the seiyuu board at 2channel, by number of posts per day. This list -- especially the bottom half of it -- will shift over time, as different seiyuus gain and lose prominence. But this is where we are today.
The first of the two middle columns is number of posts per day in a thread. The next is the total number of thousand-post threads that have accumulated over time. To help identify the seiyuus, I give a role, new or old, that each is associated with.
|1||Mizuki Nana||216||571||singer, Fate in Nanoha|
|3||Chihara Minori||96||184||singer, star in Chu-bra|
|5||Hirano Aya||72||188||Suzumiya Haruhi|
|6||Asumi Kana||72||81||Yuno in Hidamari|
|8||Horie Yui||57||371||Hanekawa in Bakemonogatari|
|9||Sakamoto Maaya||50||145||Nino in Arakawa|
|10||Nakamura Eriko||50||73||Idolmaster games|
|11||Tomatsu Haruka||45||31||Nagi in Kannagi|
|14||Nakajima Megumi||42||39||Ranka in Macross F|
|15||Hikasa Youko||40||30||Mio in K-On|
|17||Sakurai Harumi||38||31||Yuri in Angel Beats|
|18||Hasegawa Yurina||33||271||plaintive blog; formerly Ochiai Yurika|
|19||Shimoda Asami||30||41||Idolmaster games|
|20||Imai Asami||28||92||Idolmaster games|
|21||Satou Satomi||28||16||Ritsu in K-On|
|22||Harada Hitomi||28||8||Himeji in Baka to Test|
|23||Mizuhara Kaoru||28||32||Misao in Lucky Star|
|24||Katou Emiri||27||37||Hideyoshi in Baka to Test|
|26||Kitamura Eri||26||38||Rin in Kodomo no Jikan; artist/otaku|
|27||Mizuhashi Kaori||26||63||Miyako in Hidamari|
|28||Itou Kanae||26||15||Ruiko in Railgun|
|30||Nemakura Manami||25||9||Idolmaster games|
|31||Taketatsu Ayana||24||12||Azu-nyan in K-On|
|32||Gotou Yuuko||22||82||Hiro in Hidamari|
|33||Kotobuki Minako||21||9||Tsumugi in K-On|
|34||Satou Rina||19||30||Negi in Negima|
|35||Takahashi Chiaki||19||65||teacher in Dai Maou|
|36||Asano Masumi||18||147||Hakufu in Ikkitousen; radio host|
|37||Gibu Yuuko||17||8||Akira in Aoi Hana; TV personality|
|39||Yahagi Sayuri||17||12||Haruna in ToLoveRu|
|40||Hayashibara Megumi||17||82||Ayanami Rei|
|41||Onosaka Masaya||17||34||Momoshiro in Prince of Tennis|
|42||Tange Sakura||16||36||Cardcaptor Sakura|
|43||Sanpei Yuuko||16||25||Cure Dream in Precure 5|
|44||Itou Shizuka||16||57||Hinagiku in Hayate|
|45||Yuuki Aoi||15||4||Mina in Vampire Bund, Yutori-chan|
|46||Koshimizu Ami||15||60||Kallen in Code Geass|
|47||Yuzuki Ryouka||15||77||Yukino in Candy Boy|
|48||Noto Mamiko||15||60||Nogizaka Haruka|
|49||Kamiya Hiroshi||15||40||Izaya in Durarara|
|50||Kobayashi Yuu||15||35||Rio in Sora no Woto|
You can see that Nana-chan has both the top two threads, and almost four times the posts per day of the next seiyuu in the list. Now that is popularity. This is clearly due to her singing and her personality, since even some of her admirers do not rate her seiyuu work especially highly -- competent as it is.
Long-time top names like Tamura Yukari and Horie Yui remain near the top of the list, and older stars like Hayashibara Megumi and Tange Sakura retain their popularity.
But it also interesting to see new names rise: the cast members of popular moe anime such as K-On and Hidamari Sketch. And new voices like those of Katou Emiri and the even newer Harada Hiromi, both of whom are in Baka to Test. And Sakurai Harumi, who stars as Yuri in the new anime Angel Beats.
Once we get past the singer-seiyuus, 2channel is clearly focused on moe.
There are names there that seem unknown or little-known to me: the cast members of the Idolmaster games.
There are not many male seiyuu in the current list.
My own current favorite voices are dotted here and there within the top 50 and outside it: Hirano Aya (5), Sakamoto Maaya (9), Hanazawa Kana (16), Katou Emiri (24), Yahagi Sayuri (39), Sanpei Yuuko (43), Yuuki Aoi (45), Koshimizu Ami (46), Kamiya Hiroshi (49), Kobayashi Yuu (50), Sawashiro Miyuki (61), Takagaki Ayahi (62), Hayami Saori (70), Saitou Chiwa (71)....