I doubt Lavos is the Devil. The Devil doesn't work in that manner. If you look at it Islamic way, you'd see that Lavos could be the Antichrist, as he came to the earth ages ago, and was actually alive the entire time, and...what else...yeah. Queen Zeal though, yeah. And Magus isn't pure evil either, and he isn't Anti-Crono (if we assume Crono is Jesus.