A normal class wouldn’t be on the grading system as they wouldn’t be considered dangerous, though someone with a powerful class would have a rank of either S, A, B, C, D, E or F.

For instance, a C-class variant would start as a C1. As they got stronger they would become a C2; all the way up to a C7, which was the strongest this person could be.

Rosa, the leech queen, would have been considered an E1-class variant.