it ranges from F-S, F being the lowest and S being the Highest. their are a few cases of people having SS & SSS ranked body potential.

This has to do with the amount of Qi energy your body can take, for example:

F: 23%

E:30%

D: 45%

C: 50%

B: 73%

A: 85%

S: 90%-100% (anyone who is measured within this range, is S rank)

SS: 100-150%(Although this people have this much capacity, they tend to have some sort of Side effect. Ranging from mild Changes to appearance e.t.c.)

SSS: 151-200%(Although this people have this much capacity, they tend to have some sort of Side effect. Ranging from mild Changes to appearance e.t.c.)

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Mortal warrior or Mage 1- 3 are not considered Anything powerful till they break into Class 1, they can be compared to naruto academy students.

Class 1-3 warrior or mage are basically genins , but can be considered something... at least you could get a job as a door guard or an ordinary Soldier in the Army. *shrugs*

Class 4 is a boundary that sets you apart from others. like a fish changing into a Dragon... they can be compared to the Chuunin Rank.

Most of this people tend to be captains in the army or a squad leader.

Class 5 is like stepping into a whole new plane, The amount of Battle or Elemental Qi needed to break into this realm is nothing to Scoff at. Only those Rated from C to S ever cross to this realm, They are mostly Lieutenants or something of the like... They are Still considered Chuunin but with a Much bigger Chakra and spells xD.

Class 6 is a boundary line, here you are considered to have the appropriate Amount of Qi and Spells or Artifacts.

Now you get a mark from the God whom you serve as a sign of acknowledgement. this Mark in turn alters your Qi to match the aura of the God and this Boosts your powers according to the power of your faith.

Without a God, there would be no breakthrough as you'd be stuck at Class 5.

To advance further, one needs a special encounter based on luck or 'quest' given by your Respective Gods to break into the King realm. (early Jounin)

King class is a Matured Jounin, one's power is at least 3 folds what you had at class six but your faith determines your Strength amongst those of the same level...it's known that only people graded at least 'C' in potential can enter this realm.

if you are marked as a champion, your power is at least 5 folds stronger than your peers when your at this level.

Saint is at the level above king and this can be considered just stepping into the level of a Kage. they are mostly seen as rulers or spiritual leaders in different places in the world.

Demi God Realm Could be said to at the Hokage Hashirama Senju's level of power, what I would consider as Kage level. (😶)

In this Realm, the Gods are unable to stop whatever choices you make 'directly', also At this level one gains a stat if I'm allowed to use gaming terms.

They Gain a stat called divinity, that allows them to use the power of Faith, if said individual has followers or worshippers they are eligible to gain the Chance to become a God by infusing Faith Qi into their own Qi.

and then When they are able to merge it into one there by making it their own, they would breakthrough to confines of Humanity.

This Realm is usually easier to cross for Champions but they first have to renounce their God and face their greatest fear.

LESSER GOD realm consist of fallen Gods like Eliya or mortals who broke into this realm. though called 'lesser' They're still unimaginably powerful. as powerful as Madara during the Fourth Great Ninja war.

Only way to breakthrough from this Realm is to either defeat an Arch God and absorb their Faith Qi or You kill several Lesser Gods and absorb their Faith Qi or in the case of fallen Gods, have your champion find and unlock The seal placed on you as you can't personally access it's location.

ARCH GOD is the present highest Realm known in the universe, This Realm is the Personification Of KAGUYA OTSUTSUKI

(if you know, You Know).