RIZIN.33 was a major New Year's Eve MMA event on December 31, 2021, at Saitama Super Arena, headlined by the RIZIN Bantamweight Grand Prix Final and featured major stars like Tenshin Nasukawa's final RIZIN fight against Gomi, plus title bouts and popular matchups, wrapping up RIZIN's 2021 season.
| Actor | Role |
|---|---|
 Kai AsakuraSelf | Self |
| HHiromasa OugikuboSelf | Self |
 Naoki InoueSelf | Self |
| KKenta TakizawaSelf | Self |
 Roberto de SouzaSelf | Self |
| YYusuke YachiSelf | Self |
 Mikuru AsakuraSelf | Self |
| YYutaka SaitoSelf | Self |
 Tenshin NasukawaSelf | Self |
 Takanori GomiSelf | Self |
| RRena KubotaRENA | RENA |
| SSi Woo ParkSelf | Self |
| SSeika IzawaSelf | Self |
 Ayaka HamasakiSelf | Self |
| NNoah BeyBeynoah | Beynoah |
| KKoji TakedaSelf | Self |
 Hideki SekineSelf | Self |
| SShoma ShibisaiSelf | Self |
| HHiroaki SuzukiSelf | Self |
| KKyohei HagiwaraSelf | Self |
 Ren SugiyamaYA-MAN | YA-MAN |
| KKoji TanakaKouzi | Kouzi |
| YYuta KuboSelf | Self |
| AAtsushi SaitoShibatar | Shibatar |
| SShinobu OtaSelf | Self |
| KKazuma SoneSelf | Self |
| YYuto HokamuraSelf | Self |
| YYuki MotoyaSelf | Self |
| KKota MiuraSelf | Self |
| YYushi SakuraSelf | Self |