Xiao Meiqi, the oldest girl of the playable characters according to the wiki.

And that's it, those are all the girls that appeared only in Blue Reflection Sun if one doesn't count that woman which wasn't a playable character, so, the game basically had 4 exclusive (so to speak) girls, the other girls also appear in one of the other games (or both console games) and/or the anime.

She is the only Chinese girl in the franchise, and only appeared in a dead game.