As a Lucifer in DxD

=> Three factions 

1.)Normal human

--> Weak compared to the supernatural. Greatest strength is their brain and determination. Can only fight the supernatural if equipped with weapons or sacred gears. Cannot fly.

2.)Low rank devil/Two winged angel/Two winged fallen

--> Stronger by a large margin than normal humans. Enough to destroy a small house easily. Basic skills are used. Can fly slowly. Can be defeated by normal human under special cases.

3.)Mid rank devil/Four winged angel/Four winged fallen

--> Way stronger than a normal human. Can destroy a building easily. Can reach speed faster than cars. Punch through concrete. Can be defeated by peak human with weapons or sacred gears.

4.)High rank devil/Six winged angel/Six winged fallen

--> Can destroy a city. Reach speeds greater than sports cars. Punch through steel. Have ridiculous stamina. Can be defeated by rigoursly trained human with weakness weapons or sacred gears. Devils have clan traits and the others have good control over light.

5.)Ultimate class/Eight winged angel/Eight winged fallen

--> Can destroy a small island. Reach the speed equal to or beyond sound. Can destroy most man made materials. Masterful use of abilities. Have plenty of battle experience. Very hard to defeat. Select few with supernatural weapons or good sacred gears can defeat them after training for extended periods of time.

6.)Satan class/Seraph(Archangel)/Cadre 

--> Can destroy a country. Easily move at speeds equal to 8-10 mach. Can destroy even mythical materials. Reached the peak of their respective races. Vast combat experience. Understanding of abilities at a very deep level. Pretty much undefeatble by humans. Only a few who have trained for decades alongwith holy or demonic weapons can fight them. Longinuses users are the only ones capable of killing them in humans.

7.)Super devil/ Super angel/Super fallen

--> Surpassed the limits of their race. Can destroy entire continents. Basic level to enter the top 10 ranking. Reach speed equal to 15-17 machs. Mythical bronze or Adamantiun can't restrain them for long. Can cut off space. No human alive has reached this level.(Some exceptions are Scathach, Buddha). Punch can shatter space for some moments. Exceptional control over powers. Understanding of their concepts. Very tough to kill. Immortal by normal means. 

8.) Devil Ancestor 

9.) Devil Progenitor 

=> Dragons

1.)Low class dragon

-->From birth to 5 yrs old. Can only use its claws and teeth. As strong as a mid class devil. Very high defense.

2.)Mid class dragon 

-->About 5 to 20 yrs old. Can use breath but needs break in between. Can fly at low altitudes. Very high defense. Sharp claws and teeth. As strong as a high class devil.

3.)High class dragon

-->About 20 to 100 yrs old. Can use breath for long times. Fly long distances without getting tired. Very high defense. Can use magic. Claw and teeth sharp enough to cut through most artificial and natural materials. As strong as Ultimate class devils.

4.)Dragon King

-->About 100 to 1000 yrs old. Can use breath almost infinitely. Fly for months without break. Defense impenetrable by most. Claws and teeth strong enough to destroy even divine materials. As strong as Satan class devils. Mostly has a title which represents their speciality. Only few have reached this level. Can shapeshift to a more human figure.

6.) Dragon Monarch

-->Above Dragon king but below Hevenly dragon. Can be achieved by Dragon kings by sheer training and battle. 

7.)Heavely Dragon

-->About 2500 to 5000 yrs old. Can destroy the entire world multiple times over if not stopped by anyone. Has special abilities which can end even a god permanently. Is in the top 5 strongest beings. Only 2 dragons have said to reach this level. Require multiple beings or even entire pantheons to stop if angry. No known material divine, natural or man made can stop them. Can shapeshift. Equivalent to super devils(Only those ones which have reached the peak.)

8.) Dragon God 

--> One of the strongest beings in the world. As old as the world itself. Can destroy the entire world alongwith all pantheons and dimensions if no one interferes. Almost infinite energy reserves. Can shapeshift. Immortal. Humongous dragon form. Concept embodiments. Can break through the fabrics of space and time at will without any trouble. Above the top 10 strongest beings. Only Ophis Is known to be in this level. Equivalent to devil ancestor.

9.)True Dragon

--> Regarded as the strongest being in the world. Has a size of 250m. Age is not known. Can use conceptual attacks and has the powers of more than one concept. Shapeshifting unknown but may be possible. Can transverse the dimensional gap endlessly without any problems. Only a few beings are capable of even standing infront of them. Can destroy the entire world alongwith pantheons, dimensions even if some beings interfere. Can destroy entire pantheons without any serious trouble. Above the top 10 strongest beings.Equivalent to devil ancestor.(Peak)

=> Gods 

1.) Wild gods

--> The stage of ascension, when a normal person gains he/she divinity passes through this stage. This stage us very unstable due the binding of the divinity with the soul. The god is very weak in this state. 

2.)Low stage gods

--> Gods who dont have combat related divinities or strong divinities. They are also young. But combined with those bodies and energy can be scaled above or equal to high class devils. 

3.)Intermediate stage gods 

->Gods who have divinities which aren't combat related but also not too weak. A certain number of believers belive in them raising their divinity. They can be equivalent to ultimate class devils.

4.)High stage gods 

-->Gods who have combat related divinities or widespread concept divinities. They have a large number of belivers, appear more frequently in myths. They also have temples of their own. Equivalent to satan class devils.

5.)Ultimate stage gods 

-->All of the gods who are God king reach this level. Due to gaining authority over an entire pantheon. Their base strength is that of a high class god but their myths and divinities are boosted by the God King title. 

6.)Mighty stage gods

-->The gods at this level are in the top 10. Their divinities are mostly combat related or higher concepts which apply to the entire world like day, night, death etc. Even the these gods have completely understood their divinities and can use it fluently as breathing. Very strong. Super devil equivalent.

7.)Supreme stage gods 

--> These gods have reached a level beyond their divinities and making their divinity equivalent to the concept of it's own. The gods who are in the top 5 are at this level. They are ridiculously strong to the point that other beings even fear meeting them. Most of them have an unofficial agreement on not interfering or fighting unless something urgent is there. They can easily destroy the world and dimensions even when interrupted. Only be stopped by someone on the same level. Devil ancestor level.

=> Some extra points:-

1.) Great Red, Ophis and Trihexa are at the same level. GR knows how to use his powers while Trihexa is a mad beast. Ophis doesn't know either. She is dumb.

2.) Yokai dont have a fixed system but for the tailed ones, number indicates the strength higher the tails stronger the Yokai. They can also use leylines to get stronger temporarily.

3.)Top 5 beings are in the Supreme god class/Heavenly dragon/Devil ancestor. The angels in the top 5 were due to Big G and heaven system boost.

4.)More levels will be introduced as the story progresses.

5.)The age factor of Dragons is just a basic measure, some young dragons can also be much stronger for than their age.