So, one thing I really liked about the first edition of Con-Quest is that all the characters had all of their strip stages visible in the gallery, even their Echo versions, which I thought was really nice. In previous versions, this edition didn't have a gallery, but it does now, which is great. However, it is incomplete in a lot of ways. For one, some of characters only have their fully-clothed sprites and their nude ones, but none of the in-betweens, like the Tifa cosplayer and the Peach cosplayer. Also, a couple characters have different cursed and uncursed clothing, (like the Peach cosplayer and Lilly) which, while not necessary, would be nice to see since you included Echoes in the first game's gallery. And for two, there are some who are missing entirely, although the missing ones are mostly just the unsavable Echo-type enemies, like the Echoes of the girls from the first game, and the Camo echo, but this also includes the boss Cursed Phoebe and the sprites for the later fight with Scarlett. But, I understand why you wouldn't want to put the cosplayers from the first game into the main gallery, and some images, like those for the Scarlett refight and the Cursed Phoebe boss, overlap with existing characters. It would obfuscate the gallery's purpose as a sort of scene viewer, and it would clutter it a lot, while also possibly even causing copyright risk from adding entries for the old game's girls.
So, my proposed solution is: Implement a Bestiary, or some other name like a Cosplay-pedia, and make it similar but separate to the proper gallery. Essentially, my idea is that the Gallery would have the character bios, the unlocked scenes, and the main uncursed clothed/nude sprites of the savable characters/those you can have scenes with, where the bestiary would have sprites for each damage level of all of the enemies, like all the Echoes of the Poke-Con girls, cursed versions of the main gallery girls, and their refights. You could even put images in the bestiary of the non-cosplayer enemies like the Cosplay Blob, or the TV rat or the various Froglins. I imagine the bestiary could be less detailed than the Gallery, maybe just the enemy name and their sprites, but if you wanted to put in the effort, you could write little descriptions of the various enemies, although I personally would have trouble coming up with unique things to say about 3 different colors of Lantern Froglins, or 3 different sizes of Joyce Echoes.
(TL;DR) In summary, I loved how complete the old version's gallery was, but while this one is getting better, it's not quite there yet. Due to this version having a distinction between "minor", unrescuable enemies and more "major" rescuable girls, I would propose a more distinct "bestiary"-type menu for the "minor" enemies, as well as alternate versions of rescuable girls like the boss Phoebe, so as not to clutter the main gallery, while still allowing all enemies, and variations like refights, (such as Scarlett's) Cursed versions, and Echoes, to be viewable like in the old version. Although most of my problems could be solved through other methods, so feel free to take my input into account in whatever way would be easiest for you and you feel would be the best for the user experience.