This is mostly a rehash of where we are now, but this is both good for provoking discussion and for having these scans all in one place, since they'll be added to the profiles regardless (we really need to be better about scans). Don't expect this to cover absolutely everyone, though I'll do my best to touch on as many characters as possible. This should likely cover any future tier upgrades as well.
Starting with Doremy, we know
she's on the lower rung of high tier youkai. Tengu,
being considered generally strong youkai, should upscale. While no characters directly scale to or upscale from Aya or Hatate (except Lord Tenma and Megumu, neither of whom have pages), we can jump forward a few steps in the scaling chain and jump to oni, with even the weakest oni being considered superior to
tengu society as a whole. From there we have Suiki, a kishin, and as
kishin command numerous lesser oni, they should upscale. Clownpiece is stated to be on par with kishin, so she scales, but more importantly,
hermits fight on par with kishin all the time to sustain their immortality, so they scale as well. From there, we have
Marisa almost killing Seiga on accident, showing she upscales from hermits pretty easily. There's also stuff like Ichirin being considered a rival to Futo, and Byakuren and Miko being rivals as well. Celestials are considered superior to hermits, which is where Tenshi comes in. From there, we can scale Joon and Shion to this level via
their fight against dream Tenshi, and scale Reimu as well due to her
fighting and overpowering an unsuppressed Shion (albeit with some difficulty, showing the two are roughly comparable). On the topic of hermits, Kasen is also one, though she exists outside their place in the scaling chain, as
Miko states Kasen is overwhelmingly superior to her. In that same vein, we see her
overpowering Reimu without much effort, and
basically laughing off her Fantasy Seal. Reimu downscales heavily due to surviving an attack that was likely meant to kill her in this scene. From there, we have the oni who are considered the Big Four of the Mountain (Kasen, Suika, Yuugi, and ???). They should all be treated as roughly equal, except for Yuugi,
who is stated to possess the greatest physical strength out of them. From there we can scale Yukari to this group, as
she has fought Suika many times in the past. I unfortunately could not find a source for her supposed superiority to Suika, so we should replace that on her profile. That's it for Gensokyo's scaling chain. Lunarians such as Yorihime and Toyohime should upscale from Gensokyo denizens as a whole based on
this statement. From there, Eirin,
being the one who originally taught the Watatsuki sisters and being one of the former highest authorities in the Lunar Capital, should upscale yet again. Sagume, Lord Tsukuyomi, and most lunar gods would be at this level as well. Junko upscales from the Lunar Capital as a whole, as she is depicted as a significant threat to it.
She also straight up killed Houyi, a lunar god. And Hecatia... is Hecatia.
We all know where she sits in the scaling chain.
So here's what the scaling chain looks like. We can use this to roughly categorize everyone else based on their own scaling.
Hecatia >>> Junko > Lunar Capital god tiers (Eirin, Sagume, etc) > Watatsuki sisters > Suika, Kasen, & Yukari > Reimu >/= Shion > Tenshi > Hermits > Kishin > Regular oni > Lord Tenma > Megumu > Aya & Hatate > Doremy
A few miscellaneous things to note:
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Sakuya was unable to harm Tenshi with her knives, meaning she must be below Celestial tier in the scaling chain. However, Tenshi does acknowledge her strength, so she isn’t too far below that level.
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Vampires are considered some of the strongest youkai in recent history, making them somewhat comparable to other ‘strong’ youkai species like tengu and oni. However, considering Remilia lost against various strong youkai during the vampire incident, this is probably where she peaks. Though, considering Suika has
this to say about Remilia, that might be a little generous. The only reason I’m not using that to discredit scaling Remilia to oni entirely is because 1. Trash talk like that is typical in spell card duels and 2. Suika is a member of the Big Four of the Mountain, which means Remilia could still scale to regular oni while being inferior to Suika.
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Youmu was unable to harm Keiki's ceramics, which would include Mayumi, with Mayumi being designed to fight beast spirits like Yachie and Saki, who scale off of Yuuma,
who fought Flandre (in an assassination attempt, making spell card rules meaningless), with Flandre being
far stronger than Remilia. This means Youmu is at best comparable to Remilia, while the Animal Realm group and anyone comparable to them is above oni tier. Although
Marisa implied one of Youmu's attacks would be serious if it hit her, this is harder to quantify than the actual scaling shown, and could maybe potentially be death manip or some other form or durability negation based on the “touch it and death creeps up” comment. Should also mention that Saki is
stated to be "the strongest beast spirit", so she likely upscales a fair amount.
-Koishi is, surprisingly, very high into the scaling chain given how
Kasen considers her 'ridiculously strong'.
Kokoro scales off of being her rival.
-Mokou's durability scales to the weakest high tier playable character in Imperishable Night, as she was able to
tank multiple serious attacks from them before 'dying'. Kaguya would scale to this level as well by virtue of killing Mokou regularly. Note that Mokou is likely a glass cannon, as
her regular attacks deal recoil damage to herself, and
her fire based attacks can destroy her body, implying she's overcoming her own durability in both cases. The latter has more examples, I just don’t remember them off the top of my head. I’ll track them down if needed, though.
-Marisa and Alice get additional upscaling from Kaguya, given how
she considers them extremely strong, even relative to other lunarians, in one ending of Imperishable Night. Kaguya herself, being a member of Lunarian royalty, upscales from Doremy at bare minimum.
-Utsuho could very well be on par with Lunar Capital god tiers due to
her main power source being Yatagarasu, a lunar god. I will say that the “Watatsuki sisters are more powerful than everyone in Gensokyo” line of logic doesn’t apply here (it never made much sense to me considering that statement also encompasses Eirin too), since it contradicts the established scaling. After all,
Yorihime is actively amped by the lunar gods, so them being weaker than her makes very little sense. It's not really an outlier either, as we don't have much to suggest that anyone scales to Utsuho directly iirc.
-Nue should be at least above hermit tier, as
Byakuren considers her superior to Ichirin.
-Marisa, despite lacking scaling on par with Reimu's, should still downscale from Reimu. When they fight,
it is stated that while the fights between the two are skewed in Reimu's favor, Marisa still wins from time to time, meaning Marisa must have enough power and durability to contend with Reimu. However, part of the reason Reimu wins more often is because of her passive completely busted bullshit abilities, implying the two are about even in stats and Reimu just outhaxxes.
Oh btw Doremy is about several dozen universes into 2-C based on her danmaku patterns, while Tenshi is just a vague 'many' (though likely higher than Doremy based on their scaling).
We also need to nuke any "Comparable to (x)/( y)" justifications without good reasoning, with Reimu and Marisa being the main culprits. Feel free to add any scaling justifications you feel are missing, there are probably a lot.
Finally, the justifications for Tenshi and Doremy should be as follows. Tenshi should also get a note explaining why she scales to her dream self.
Her dream self was capable of shaking the Heavens, and was threatening to destroy them entirely. Heaven is composed of many separate realms that are both infinite in size, and as Otherworlds, should be brane worlds with their own laws of physics and flow of time.
Note: While Tenshi shaking the Heavens was performed by her dream self, dream versions of characters are treated as perfectly identical to the original in all categories save for personality. As such, it can be safely assumed that the real Tenshi could replicate this feat as well.
Can create, destroy, and eat dreams. Each dream contains multiple infinitely sized realms such as Hell and the Netherworld, and it is said that one can go anywhere within a dream, implying far more locations exist within them. She can also weaponize dream souls, which are the manifestation of one’s dream. In doing so, she can absorb several dream souls at a time from her foes, or shoot out dozens simultaneously in her danmaku patterns.
I thiiiiink that just leaves characters like Kanako, Suwako, and probably a few others I overlooked, though really, this is just a result of me being extremely tired. A lot's been going on on my end lately but I'll still try to update this when I can.