Discussion VisualNovel / DaCapoII

A lot of the expy example seems like misuse/another trope, but I'm not familiar enough with the work to tell. Several characters were previously listed on the same bullet point, but I separated them out to provide my thoughts on each character:

• Expy:
  • Most of the characters are reminiscent of characters in the original Da Capo, with some of them being descended from characters in Da Capo, though the only genealogies that are confirmed is that Yume and Otome are Junichi and Nemu's grandchildren, and Nanaka is related to Kotori, though it's been said that Nanaka also blood-related to Junichi. | Descendants would probably fall under another trope, like Generation Xerox, Strong Family Resemblance, or In the Blood.
  • Specifically, Yoshiyuki is an Expy of Junichi | How?
  • Minatsu is a combination of Miharu and Mako | Misuse - a character cannot be an expy of more than one person. Maybe it's another trope?
  • Nanaka takes over for Kotori, since she's also a Shirakawa | I'm not sure what "takes over" means, but just having the same name (?) isn't enough to qualify as an expy
  • Yume is a combination of both Junichi and Nemu (though Otome also resembles Nemu whenever she has her hair up). | Again, misuse, since expies can't combine traits from different characters. Again, maybe another trope?
  • Most blatantly is Suginami, who may very well be the same Suginami from 53 years ago. | Maybe, though it doesn't explain how. Also, if it's just the same character, then that's something else entirely
  • More specifically, supposedly, Yoshiyuki is the son that Junichi and Sakura never had, while Nanaka is the daughter that Junichi and Kotori never had. | Strong Family Resemblance? Generation Xerox?
  • Though not quite expys, Erika and Izumiko of the first Da Capo game both share the same surname, Murasaki. Although it's just an alias for the both of them. On that note, both of them are also aliens, though Izumiko isn't a princess. | Misuse; flat-out says they're not expies. I have no idea what this might be, if anything.
  • And while we're at it, there are also ghost girls Kasumi and Mahiru in both of the Plus Communication games. | I have no idea what the relevance of this is.
  • On the other hand, Sakura is still the same Sakura entirely (though the cat Utamaru has been replaced with a dog, Harimao). | So it's just the same person appearing in two games in a series?
  • And in the game, Aisia is the same Aisia. | Again, just the same person making another appearance?
  • Mizukoshi also takes over for Koyomi. | How?

Edit: Tweaked for clarity/easier reading

Does anyone know who the girl Sakura meets in the epilogue is? Or who the blond girl Yoshiyuki runs into occasionally during the story if you don't meet with one of the heroines?