“I can’t kill you, Jiro,” Ren said. His voice was a synthesized baritone, flat and sorrowful. “You’re already dead. I can only reset you.”
Ryujin is introduced as a cursed being from a parallel world, which was sealed away. He becomes Kamen Rider Gekkostate after breaking free from his seal. Kamen Rider Mugen Android
The best way to get started is by looking at community hubs where creators share their builds: MUGEN Archive “I can’t kill you, Jiro,” Ren said