Campanella – Kanae Itou (Natsumi Hayamiya from Birdy the Mighty Decoded, Airi from Queen’s Blade, Amu Hinamori from Shugo Chara!, and others.)
Arios – Toshiyuki Morikawa (Isshin Kurosaki from Bleach, Naraku from Inu Yasha, Aoki from X, Yuan from Tales of Symphonia, Dhaos from Tales of Phantasia, Roy Mustang from Full Metal Alchemist, Sephiroth from the various Final Fantasy things he’s in, Heishiro Mitsurugi from Soul Calibur, and plenty others.)
Sigmund – Tetsu Inada (Nappa in Dragonball Kai, Mukoutsu in Inu Yasha, Graham Jones and Julius Belmont in Castlevania: Aria of Sorrow & Dawn of Sorrow.
Shirley – Ayana Taketatsu (Azusa Nakano in K-On!, Kirino Kosaka in Ore no Imoto ga Konna ni Kawaii Wake ga Nai, Tsubaki in Trinity Universe)
Arionrhod – Aya Hisakawa (where to begin? Just… look at the wiki. :D;;)
Source – New Dengeki PS. I’ll be making scans when I receive it.