Main cast:
Sorouka Ikuta: Nobuhiko Okamoto
Igsem Yatorishino: Risa Taneda
Shamiyu Kitora Katovanmaninik: Inori Minase
Remion Torway: Ryousuke Kanemoto
Matthew Tetojirichi: Junji Majima
Becker Harouma: Haruka Chisuga
Also, art about the upcoming series updated:
http://dengekibunko.jp/title/alderamin/