Contrary to the Western version of the game, which more or less started over with a completely new and different cast, Star Fox: Assault's Japanese voice cast would actually bring back quite a few of the voice actors from Star Fox 64's Japanese dub:

• Hisao Egawa (Falco)
• Kyoko Tongu (Slippy)
• Tomohisa Aso (Peppy)
• Daisuke Gori (Pigma)
• Shinobu Satouchi (Leon)

Of the returning cast from Star Fox 64, the only characters to be recast were:

• Fox (voiced by Shinobu Satouchi in SF64, now voiced by Kenji Nojima)
• General Pepper (voiced by Daisuke Gori in SF64, now voiced by Michihiro Ikemizu)
• Wolf (voiced by Hisao Egawa in SF64, now voiced by Mahito Ōba)
• ROB 64 and Andrew (both were voiced by Daisuke Sakaguchi in SF64, now they're both voiced by Yusuke Numata)

According to Takaya Imamura in a Nintendo Dream interview regarding Star Fox Assault, Fox's new voice was meant to represent a middle ground between Steve Malpass' nasal sounding voice from Star Fox Adventures and Shinobu Satouchi's voice from Star Fox 64. Apparently, Satouchi was saddened when he discovered that he'd be returning to only reprise his role as Leon in Star Fox: Assault.