Just thought about introducing the power levels I'll be using in the novel, so that you don't have any problems:) Here we go:

1|Power ranking system of League:

EX>SSS>SS>S>A>B>C>D>E>F [Each level till S-class has 3 sub levels(F+>F>F-)]

2|Power ranking system of Angles:

Seraphim > Cherubim > Thrones ..... Highest order

> Dominions > Virtues > Powers ..... Middle order

> Principalities > Archangels > Angles ..... Lowest order

3|Power ranking system of Demons:

Primordial > Sin > Demon lords ....Highest order

> Demon kings > Royal > Arch .....Middle order

> Greater > Common > Lesser .....Lowest order