Didn't get a proper chance to do this before but Asagi is missing a Key and her strongest powers.
Long story short, Asagi wishes to be the main character so badly that she Reality Warps the entire Netherworld/Universe Valvatorez and his party are in (Hades) and goes further beyond reaching multiple other places across dimensions , affecting not just the whole population of the Netherworld into ridiculous or mindless behaviours, but other Overlord class characters as well (like Laharl, Etna, Flonne and even Valvatorez own post-game party).
...Until they start resisting it or literally slap some sense into the affected victims.
And indeed, it's not a random power-up that came out of nowhere, but it comes from her merging with the "Fear The Great System" post its termination. And Fear the Great is one of the particularly strong things that Nipponverse has to offer as far as in-verse story is concerned.
It affected the entire netherworld via her thoughts alone from worlds away and it affected several main characters from different games simultaneously as well while still growing in power so...
I feel she should get a separate key for this incarnation.
I think that about wraps it up. Asagi should get a second key (Still Low 2-C) with these powers. Said Key should be called "With Fear the Great System" or simply "With Fear the Great" and these powers and higher range should be added.
Witch and the Hundred Knight confirmed Nipponverse's Cosmos as having infinite timelines yet another verse has done it before Pokemon? Wew.
While it doesn't affect this particular revision (because Fear the Great isn't affecting all worlds or anything of the like), that's actually news for the verse. Some top tiers could get a tier change from it depending on how it is, but right now I can't binge watch the game's story.
To be fair, while Metallia appearing in Disgaea as DLC doesn't necessarily mean she can contend with Overlords and the like (depending on the story of her game), it all but guarantees that her game takes place in a part of the same Cosmos.
Yeah Metallia for most of the game looks to be no where near overlord class. But the final boss, and the version of her show up in the post game of, labyrinth of refrain. Might out put her on that level.
Though I do have a question. Is the master&apprentice system/scrolls considered a canon thing in the nipponverse?
@DragonStitch The system, probably, since they incorporate it in the story every now and then. Kind of the same way Dominion in Soul Nomad is an actual thing in-verse that makes characters stronger in the story while also being a mechanic in the game for the units you use.
Though of course, that doesn't matter for the revisions proposed here either.
2-B to 2-A, I'd probably still have to binge watch a playthrough of some of the games in the verse that I'm still not familiar with (Namely Disgaea 5 and Metallia's) to see if there's a possibility, since in some of the endings every now and then a character or another does destroy the entirety of the Cosmos overtime or takes over all of it (Hakaishin Alexander and Pram the Oracle respectively, to name a few).
Up until now the Cosmos was seen as "countless universes" so that didn't warrant any upgrade for the God tiers as the feats are done overtime, but if it's indeed Limitless and depending how that works, they might get an upgrade.
From what I'm aware of the only game that might have an ending where the Cosmos is destroyed is in the Evil Mao Ending in Disgaea 3 where Mao destroyed everything and it is implied to be instant, however, the ending is a bit vague on whether it is the entire Cosmos. Here's the quote from the ending:
"And then there was no one. No human World, no Netherworld, no Celestia. Everything disappeared, and was gone..."
In Makai Kingdom Alexander destroys it Overtime in a bad ending. While Pram takes control of all of it and nobody manages to take her out, but both are done over a really long time (In Pram's case I think it was done over tens of billions of years or something to that effect). Hence why I'd need to check.
Mao's ending probably doesn't mean the whole Cosmos, since in Disgaea 1 Celestia and the Netherworld were still considered part of the same Universe, and Pram mentions in Makai Kingdom that the Human World is "about as significant to the Cosmos as a speck of dust."
Like I just said, Alexander for one destroys the whole Cosmos in Makai Kingdom in one ending, and Pram takes over all of it in another.
Demon path of Soul Nomad has Revya destroying both of her home Universes (Haephnes and Drazil) in two or three blows and so on.
Unless you mean only in the Disgaea Games as opposed to the entire Nipponverse, in which case, yes, I don't remember any other Universe Destroying endings other than those already mentioned either.
Considering there's a bunch of evidence, how nobody else seems to have anything to say against the revision pointed in the OP and how the people who did reply seem ok with it, I wonder how long we'll still need to bump this before the changes can be applied, tbh.