Some voice actor info:
Tetsuya Azuma / Casshern:
Tohru Furuya (Amuro Ray from Gundam, Yamcha from DB/DBZ, many others)
Luna:
Akiko Yajima (Kyoko from Denno Coil, Miyako from Ghost Hound, Relena from Gundam W)
Ohji:
Cho
Bryking Boss:
Kenji Utsumi (He also played this role in the original 1973 series!)
Lyuze:
Nami Miyahara
Ringo:
Yuko Minaguchi
The OP will be Aoi Hana (Blue Flower) performed by
Color Bottle.