I just see the random girls as 'generic examples' of a particular character type. Yes, the image set might be the character XYZ but for the context of this game she's just an archetype. If they didn't have an image set nobody would want to use them, and they're needed in-game to fill a number of roles a unique character would not make sense for. The Dragon Quest 3 characters work extremely well for this since they ARE just generic characters, but there are only so many cases of generic characters with sufficient art to use here. There's nothing stopping people from upgrading a random pack to a unique character if they like that character, so I see nothing wrong with leaving it up to user choice here. I'd rather see a nice looking image pack, but if you don't you can just delete all the images in the random girl packs and have them all use the default set.