Here is a list of the voice actors who worked on the various drama albums. Credit goes to Relle for looking them up on Japanese Wikipedia while my mind is currently imploding as I work on revamping the site.
Dragon Knights
Rath: Seki Tomokazu , Ishikawa Hideo
Rune: Ogata Megumi
Thatz: Onosaka Masaya
Cesia: Touma Yumi, Imai Yuka
Lykouleon: Miki Shinichirou
Ruwalk: Takagi Wataru
Kaistern: Midorikawa Hikaru
Nadil: Okiayu Ryoutarou
Shydeman: Ono Kenichi
Shyrendora: Kanoki Shouko
Fedelta: Kisaichi Atsushi
Kharl: Midorikawa Hikaru
Bierrez: Ishida Akira
Zoma: Nagashima Yuuko
Baba-sama: Aizawa Masaka
Tintlet: Okamura Akemi
Delte: Asami Junko
Nohiro: Ueda Yuuji
Kitchel: Nagashima Yuuko
Master: Midorikawa Hikaru
Garfakcy: Chiba Isshin
Lumen Lunae
Kai: Hoshi Souichirou
Aika: Yamazaki Wakana
Hisanagi: Chiba Susumu
Kiryuu: Seki Toshihiko
Kaiga: Itou Kentarou
Kurouzu: Morikawa Toshiyuki
Kugunari: Kumai Motoko
Takafuji: Aoki Makoto
Jizaimaru: Inada Tetsu
Sakumo: Okiayu Ryoutarou
Kikuitadaki: Takimoto Fujiko
Shizukuishi: Katou Yuuko
Hitaka: Miyazaki Issei
Baisetsu: Yamaguchi Yuriko
Kouro: Yanagisawa Mayumi
Amenomori: Imamura Takahiro
Female Student A: Matsumoto Sachi
Female Student B: Kitajima Chieko
Male Student: Hagiwara Hideki
Information Seller: Matsumoto Ooki
Shadow Pilgrim: Kishio Daisuke