Sister Mary Jayne. She looks menacing.

It's interesting that she looks demonic, with a blood red background, and is exposing her bare buttocks, yet she has a halo over her head, indicating that she is angelic.

Perhaps it is her strong devotion to Jesus Christ, her lord and savior, that redeems all sins. She shows that devotion (while exposing her bare buttocks) through her tattoo which explicitly states that she gets euphoria from Jesus. The marijuana leaf is clearly akin to the body of Christ and the bong water is the blood of Christ.

But maybe that's not a halo at all, but a portal between hell and earth through which the demon nun plans to ascend and spread lust and deprivation across the lands while collecting the souls of those who are not true believers in Christ Almighty.