Seiyus:
Unshou ISHIZUKA: Jet Black (Cowboy Bebop), Van Hohenheim (FMA Brotherhood), Marus (Guin Saga), Bunta (Initial D), Job Trunht (LOGH), Zabuza (Naruto), Sanga (FotNS), Kizaku (One Piece), Quent Yaiden (Wolf's Rain), and Ryuuzou Takehara (X'amd) are some of the bigger roles I've seen him in in some of the better animes, but his full lost of roles played is one of the biggest in the industry
Fumihiko TACHIKI: Kenpachi (Bleach), Mana Walker/Narrator (D.Gray-man), Gendou Ikari (Evangelion), Sloth (FMAB), Hasegawa/Narrator (Gintama), like 50+ different parts in Lucky Star, Akainu/Don Kreig (One Piece), Daedalus/Plaktu (Escaflowne), Yuichi Takagi (Wangan Midnight), Yuuichi Kirisaki (Yakitate!! Japan), and Talbo (Zegapain), another of the real powerhouses in anime
Kazuya NAKAI: Kanzo Mogi (Death Note), Miles (FMAB), Hijikata Toshirou (Gintama), Kouzou Etou (Nodame Cantabile), Karasu/Noein (Noein), Roronoa Zoro (One Piece), Mugen (Samurai Champloo), Shizuka Doumeki (xxxHolic)
Akira ISHIDA: Kaworu Nagisa (Evangelion), Ryūnosuke Uryū (Fate/Zero), Katsura Kotarou (Gintama), Athrun Zala (MS Gundam Seed), Gaara of the Desert (Naruto), and a whole bunch more stuff that I haven't seen yet
Wataru TAKAGI: Genta Kojima/Officer Takagi (Detective Conan), Eikichi Onizuka (GTO), Kenji (Initial D), Tobi (Naruto Shippuuden), Bellamy (One Piece), and lots of bit parts in things I've seen like Crackerjack (Outlaw Star)
Takehito KOYASU: Shin Kazama (Area 88), Dan Simmonds (Aregentosoma), Luck Gandor (Baccano!), Klowal Febdash (Banner of the Stars), Pesshe Gatiishe and a couple others (Bleach), Shigeru Aoba (Evangelion), Scar's Brother (FMAB), Jubei Kakei (Getbackers), Takasugi Shinsuke (Gintama), Ryousuke Takahashi (Initial D), Neo Roanoke/Mu La Flaga (MS Gundam Seed), Zechs Merquise/Milliardo Peacecraft (MS Gundam Wing), Aokiji (One Piece), Yuri Mihairokoh (Planetes), and many, many more, certified as the hardest working seiyu with 418 roles to his credit, more than 60 more than the next most prolific cast member on the list
Shinichiro MIKI: Makoto Shinjou (Area 88), Urahara Kisuke (Bleach), Assassin (Fate/stay night), Kurz Weber (Full Metal Panic!), Roy Mustang (FMA), Sakamoto Tatsuma (Gintama), Takumi Fujiwara (Initial D), Neil Dylandy/Lockon Stratos (MS Gundam 00), and Tatsuya Shima (Wangan Midnight) among again many other roles, demonstrating incredible versatility
Houchu OHTSUKA: George Miyagusuku (Blood+), Bill Collins (Gunsmith Cats), Yazan Gable (MS Zeta Gundam), Jiraya (Naruto), Masayoshi Kuki (RahXephon), and many other recognizable parts here and there, very distinct voice
Kazuhiko INOUE: Ryuu Takagi (BB), Nefee/Nereis (Banner of the Stars), Hatori Soma (Fruits Basket), Dusty Attemborough (LOGH), Keiichi Tamaru (Haruhi), Jerid Messa (MS Zeta Gundam), Kakashi Hatake (Naruto), Nyanko-san (Natsume Yujin-cho), and again so much more
And I'll second AOS- on Aya Hirano, one of the few female Seiyus that stands out for me
Looking over this list, a couple things are obvious. First, the Gundam franchize is extremely well funded and has gone out and gotten great voice actors as a top priority throughout the years. Second, while Initial D producers failed to get the best animators, they succeeded in betting the best voice actors, something I think many of us who enjoy the series can agree on.
