Ranks and Crossover Worlds:

F - Average humans.

E - Athletic Level humans.

D: Street Level: stands at the threshold of human strength and capabilities, represented by Olympic-level athletes.

C: Wall Level: characters that can destroy or significantly damage extremely resistant materials such as stone, metal or steel.

B: Small building level: characters capable of destroying rooms or entire small constructions such as houses or more modest buildings.

A: Building level: characters that can destroy medium-sized buildings and constructions.

S: Large Size Building level: Characters that can destroy large buildings such as skyscrapers.

SS: City block level: Characters that can destroy urban city blocks or equivalent areas of space.

SSS: Multiple city block level: Characters that can destroy multiple urban city blocks or equivalent areas of space.

Ex: City level ( 10-100 times stronger than SSS Ranks)

???

Every Rank is further divided into three stages. Example: (A-) (A) (A+)

Note: It is an estimated assumption according to destructiveness capability but It may vary according to a person's Skills and how he utilizes them.

Crossover Worlds:

The Bully In Charge

Mercenary Enrollment

Lookism

Boss in School

Baki

The Descent of Demonic Master