rie tanaka, takashi kondo, lida toshinobu

i think its Jun Fukuyama
his voice is not bad & i keep running into shows which has his voice

Saori Hayami as Musubi in sekirei
Aya Endo as Matsu in sekirei
Kana Hanazawa as Kusano in sekirei
Ryotaro Okiayu as Raideth "Rai" Fujiwara Branstein in super robot wars OG
Chihiro Suzuki as Luke Fone Fabre in Tales of Abyss
Yukana as Tear Grants in Tales of Abyss

there is a lot, but one for sure is the one who plays Kagura's voice in Gintama..

Jun Fukuyama
special a (kei)
Vampire Knight (Aidō Hanabusa)
KimiKiss pure rouge (Akira Hiiragi)

Mamoru Miyano
Vampire Knight as Zero Kiryu, Ichiru Kiryu
Ouran High School Host Club as Tamaki Suou
Skip Beat! as Shoutaro/Shou Fuwa

Yui Horie
Vampire Knight Guilty (Yuki Cross)
Fruits Basket (Tohru Honda)

thats all i can think of right now

I love, love, love Miyano Mamoru! He can be so creepy and bone-chilling in Death Note, so tragic in Vampire Knight, and so freakin' hilarious in OHSHC! (My favorite role that he's played has got to be Tamaki. I couldn't stop laughing when he cried "Mon ami! Mon ami!" after Kyouya (or was it Hikaru/Kaoru?) agreed to be his friend(s)!

For females I also love Hayashibara Megumi; she does the voice for Faye Valentine, Ayanami Rei, and Urashima Haruka (the aunt from Love Hina). She's got this raspy quality to her voice. It sounds really mature and sexy if I do say so myself I really prefer female characters with a mysterious tone to their voice, rather than the high-pitched 'listen to me i'm soooo kawaii' sound. Not to say that I don't seiyuus with a softer voice either

Ah, how I wish I was fluent in Japanese and had the talent that some of these seiyuus do. Amazing how seiyuus in Japan are celebrites, but in America, no one really knows much about voice acting at all!

Sakamoto Maaya (Haruhi's voice from OHSCH) is great too! She's got a lovely singing voice too

edit: Ah, I'm going to have to check out some of the other seiyuus others mentioned on too ^^

Takahiro SAKURAI
Black Blood Brothers as Jirou Mochizuki
D.Gray-man as Yu Kanda
Kyo kara Maoh! as Yuri Shibuya

Maaya SAKAMOTO
Mobile Suit Gundam Seed Destiny as Lunamaria Hawke
Ouran High School Host Club as Haruhi Fujioka

Kenichi SUZUMURA
D.Gray-man as Lavi
Mobile Suit Gundam Seed Destiny as Shinn Asuka
Ouran High School Host Club as Hikaru Hitachiin

Romi PAKU
Bleach as Hitsugaya Toushiro
Fullmetal Alchemist as Edward Elric
Gakuen Alice as Natsume Hyuuga
NANA as Nana Osaki

Mine would have to be Yukari Tamura:

It seems like she voices in 90% of the animes I watch...
for example:
Magical Girl Lyrical Nanoha/As/StrikerS - Nanoha Takamichi
Da Capo/S.S/II/II S.S - Sakura Yoshino
Higurashi no Naku Koro Ni/Kai - Rika Furude
Clannad/AS - Mei Sunohara
Naruto/Shippuuden - TenTen

and many more

Tanaka Rie
Hirano Aya

Mamoru Miyano...as Zero in Vampire night only!

aya hirano............rie kugiyami?

Jun Fukuyama (Lelouch in Code geass)
Takahiro Sakurai (Shibuya Yuuri in Kkm, Cloud Strife)
Miyano Mamoru (Tamaki in Ouran high school host club)
Hoshi Souichirou (Kira Yamato in Gs &gsd, Makoto Ogami in Ghost Hound)
Ishida Akira (Athrun Zala in Gs and Gsd)
Seki Tomokazu (Shi Ryuuki in saiunkoku monogatari)
Paku Romi (Hitsugaya in Bleach, Edward Elric in FMA)
Mitsuki saiga (wolfram in kkm)

mamoru miyano ( zero in VK and tamaki in ouran)
nana mizuki (utau in shugo chara)
rie kugumiya (taiga in toradora, shana in shakugan, louise in zero no tsukaima)
akira ishida (gaara in naruto)
hirano aya (haruhi in suzumiya haruhi)

I don't know the name but whoever does the voice of Yuji in Zaion ~wish you were here~ is really nice..... has a great tone :o)

Rie Kugimiya