Additional character sketches were posted on the homepage
http://www.blasmi.com/character/index.html.
The minor characters are voiced by:
Reginald Drummond: Hideki Tasaka
Hugo Housman: Kazuhiko Inoue
Patty Baldwin: Michiru Yuimoto
Siegfried: Ryotaro Okiayu
Hannibal Quasar: Yousuke Akimoto