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Class - The category of the power level hierarchy be like:
Low class, Middle/Mid class, High class, Ultimate class, God class, Primordial/ Dragon God class.
Satan class, Cadre class, Seraph class, Super devil class, and Heavenly dragon class falls within God class as well.
Tiers - The level of power of something within that class like:
Low tier, Mid/Middle tier, High tier, Peak.
So this mostly comes out like "That Freed is the most powerful among those brute priests. I estimate him to be in the high tier of the high class level with the level of speed and strength he had shown or maybe possibly even higher."
You could still use the shortened version. I'm just making this clear for the future.
Of course, since this is a fanfic and I haven't watched or read DxD at all except reading fanfics, this is mostly just headcanon, wiki info, glazing, and agenda. So don't go bitching about, "Ackshually, this isn't in line with canon☝️🤓." *wipes snot from nose and adjusts glasses*
Just think of it as AU, since that's what a fanfic practically is.
Sirzechs is going to be the Gojo in this story somewhat so he is definitely gonna get glazed and upscaled for the sake of the plot.
Issei is going to be the Yuji of this fic, he doesn't compare to the goat though. But I'm gonna make Issei go through a series of character development, romance, suffering builds character, power-ups, etc. and not exactly in that order throughout the story.
The main characters of this is definitely Mahito and Issei as they are the main rivals within the story. Just know that there will be moments where they are not the focus of certain plots.
Also, humans can see Mahito, cursed techniques, and allat. This is because of the way mana works in the world of DxD, letting them perceive the supernatural. That's why supernatural beings rely on barriers and mind fuckery to keep it a secret from the mundane.
In this fic, I made it so that Issei's boost adds a 2x multiplier to his power every time he boosts. Doubling his power with each boost is too op and ridiculous, whille also being harder to scale.