Answer

The confirmed cast mixes actors, musicians, and legacy screen presence.

Makoto Daito is portrayed by Yu Shirota. Orpheus is portrayed by Snoop Dogg. The official site also lists Dean Fujioka, Moeka Hoshi, Tori Kelly, Akio Otsuka, Tokuma Nishioka, Satoshi Fujihara, Cordell Broadus, Ado, Bunta Sugawara, and Takashi Ukaji.

CharacterPerformerKnown context
Makoto DaitoYu ShirotaMain protagonist, born to an American father and Japanese mother.
Yu ShinjoDean FujiokaFriend and rival whose life intertwines with Makoto's.
OrpheusSnoop DoggSmuggler who encounters Makoto and Yu aboard the ship to Japan.
Tae MatsumotoMoeka HoshiConfirmed cast member; deeper role details are still limited.
Suzy DayTori KellySinger connected to the Shizuoka segment and showbusiness systems.
Heigo YashimaAkio OtsukaConfirmed cast member.
Kiyoshi OtsuruTokuma NishiokaConfirmed cast member.
TakashiSatoshi FujiharaSinger and Makoto associate introduced through yakuza connections.
The Veiled StrangerCordell BroadusMysterious foreigner; full role not yet revealed.
Keiko ShiraiAdoConfirmed character portrayed by Ado.
Genzo IwakiBunta Sugawara / Takashi UkajiCG character based on archival materials, voiced by Takashi Ukaji.