Low-Class: These are essentially two-winged Angels and fallen angels, They are at least 10 times stronger than a normal human.
Mid-Class:Four-winged angels, like Kiba or Koneko in the anime
High-Class: They are six-winged angels, Issei's BxB at the beginning is enough to destroy a mountain at this level.
Ultimate-Class: Eight-winged angels are here, Sairaorg was at this level when BxB and CxC first appeared
Dragon King Class / Cadre/Dai-Youkai: Except for Tiamat and Tannin, the Dragon Kings, Dai-Youkai like Nurarihyon or Yasaka and Grigori Cadres (10-winged angels) are this powerful. Essentially somewhere between Ultimate and Satan/Seraph
Satan/Seraph Class :It is the location of the 12-winged angels, Azazel and the Original Satan. People like Diehauser are here
The New Satans and the Four Great Seraphs / Low-Gods: The location of the four Great Seraphs, Falbium, Grayfia, and Serafall, also Tiamat, Here are the lesser Gods whocannot fight or are not at war
Mid-Class God: The main important Gods in mythology, like Loki and Artemis, are here, Daniele is also here right now
High-Class God: It is one of the most powerful fighting forces in mythology, people like Apollon are here.
Chief God Class: They are the main rulers of the mythologies, each very powerful, butstill variable among themselves. For example, another Chief God, Indra, is *significantly more powerful than the likes of Zeus and Odin. So we can say both position and power level
Primordial God: Essentially, they are extremely powerful Elder/Ancient beings positioned between the Chief God and the Top 10, the lowest of which is the Chief God, they can compete with the lower half(10~6) of the Top 10.
Super Devils: A Term that refers to Devils who can fight with Gods, currently Rizevim, Ajuka and Sirzech are in this position but the first one is significantly weaker than the other two. Rizevim is at the Chief God Level while Sirzech and Ajuka are in the top 10
Heavenly Dragons: It refers to the level of the dragons Albion and Ddraig, they aremuch more powerful than the likes of Odin, Zeus and even the Gods of the Bible, Fenrir and Typhon are also said to be at this level. But they are weaker than Ddraig and Albion, so we can divide(Low-Mid-High) them among themselves or just express the Base situation. Crom Cruach can be considered the strongest of this class because he surpassed both Ddraig and Albion in their Prime's
Transcendence:It is a term given to people who have attained power far beyond the natural limits of the race.
Top 10: They are the strongest beings in the world, where the beings from 10 to 6 can fight against each other while 1~5 are at different levels from them(Each of the top 5 are significantly MUCH stronger than the Heavenly Dragons) At least it looks like everyone here can fight against the Heavenly Dragons (They can fight and injure them even if the result is not Victory)
Apart from this, the problem with this is that it shows people who are not in this ranking but can beat those in the beings, for example Mahabali surpassed Ddraig and Albion in terms of output and fought against Indra.
Although this is not detailed in Canon, the situation is explained as follows in my Fic
Top 10 level beings need both extremely high power and the same level of Hax
For Ddraig and Albion these are their fire and poison
For Fenrir his Fangs
Weather Manipulation for Typhon.
....you know what I mean
Mahabali fulfills his output quota but is short on Hax, the Flame of Ddraig or Albion's poison will easily kill him
For the God of the Bible he is at this level in Hax (Miracle) but fails in overall output
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Current Brave Saints
Jokers
Dulio (Joker ) Base : Cadre/Dragon King/Dai-Youkai) → Balance Breaker : High~Chief-Class God
Daniele (Extra Joker ) Base : Cadre/Dragon King/Dai-Youkai → Balance Breaker: Seraph~low-God-Class → Abyss Side → Mid-Class God
Magnus (Extra Joker Candidate) Base : High-Class
Michael
Irina (Michael's Ace) Base : Mid-Class → Hauteclere + Balance Breaker: High~Low-Ultimate-Class
Xenovia (Michael 's Jack) Base : High-Class → Durandal + Excalibur: Ultimate-Class → Durindana (Cadre)
Zane (Michael's Queen) Base :Mid-Class
Siegfried (Michael 's 2 ) Base: High-Class → Balance Breaker+Demon Sword → Ultimate-Class
Uriel
Nero (Uriel's Ace) Base : High-Class → +Holy Fist / Balance Breaker : Ultimate-Class
Caesar (Uriel's Jack ) Base : Ultimate-Class → + Almace : Cadre Class
Gabriel
Mirana Shatarova (Gabriel 's Ace) Base : High-Class → Ultimate-Class Light Power
Griselda Quarta (Gabriel's Queen) Base : High-Class → Sacred Gear and Combat Ability : Cadre
Rossweisse (Gabriel's Seven) Base : High-Class → Spells and Equipment : Ultimate-Class
Asia (Gabriel 's Ten) Base: Mid-Class → High-Class with Magic
Raphael
Diethelm Waldseemüller (Raphael's Ace) Base: High-Class → Combat Capability :???
Others
Ryuu Heikan ( Sandalphon's 10 ) Base : High-Class → Combat capability : Ultimate-Class
Jessica Lagerkvist (Sandalphon 's Queen) Base: Mid-Class→ High-Class Defense
Kiyotora Shinra (Raziel's Ten) Base : High-Class → Battle Ability+Spirit Swords: Ultimate-Class
Claus Cafca (Remiel's Ace) Base : Low-Class