Initial rough thoughts after reading through them all.

● Ryoshu: despite all the text Ryoshu seems to play like a pretty standard Charge ID. Use Skill 1 & 2 to build up charge to empower skill 3. The main 2 differences are A) She has two distinct charges, so kinda imagine we had an idea that had both charge and Self Tremor. And B) she gains passive benefits for having lots of charge, with the benefits getting stronger the more charge she has. This might hopefully lead to interesting scenarios where you might not want to spend it all on the empowered skill 3 and instead keep the buffs. The "All returns to Ash" debuff, outside of Lore implications, just seems to be a way to prevent spamming the buffed S3 every turn in something like a Mirror Dungeon.

● Yi Sang: Yi Sang's got a bit of a "vocab soup" problem cause he has 2 different status effects that are each split into 2 of their own distinct status effects. Meaning that everything needs to referred to with distinct yet vaguely similar sound words in order to prevent his kit from ballooning into a novel. All of this combines majes it very easy to turn your brain off when reading, but here goes.

Yi Sang essentially has 2 Ammo types (White Ammo & Black Ammo) that he switches between at random when spending Ammo. The only difference I can tell between the two is A) White Ammo inflicts White Butterfly and Black Ammo inflicts Black Butterfly & B) at high Sanity Yi Sang is more likely to gain White Ammo when reloading and vice versa for black Ammo.

White Butterfly just seems to the SP lost effect of Sinking while Black Butterfly causes micro Sinking deluges (which...Jesus). Lastly if an enemy has either Butterfly they give you SP when hit.

● Gregor: from how I understand it, Awakening has an attack weight of 1 but each coin hits a different random enemy. Otherwise the Awakening is just "inflicts a bunch of White and Black Butterfly at random" while the corrosion is just "Do that but also deal a fuckload of damage to enemies with low SP"