As you guys may know, Kamui Gakupo is one of my favorite Vocaloids. But, he's also a very popular Vocaloid. So, why hasn't he appeared in any Project Diva games? Even though he's distributed by Internet Co., Ltd. and not Crypton Future Media, the Vocaloid Gumi has appeared in Hatsune Miku And Future Stars: Project Mirai before. Along with this, Gumi is made by the same company as Gakupo. But, the Utauloid Kasane Teto can also be added to the Project Diva games as well. So, why hasn't Gakupo appeared in any? Although some people say the chibi version of Gumi belongs to someone else, her voice is still used in the game. But, it could also be because Project Mirai was not a part of the Project Diva series of games. Because of this, it's hard to say if she would appear in any of the actual Project Diva games. Gumi is also a bit more popular as well, so she would be a bit more recognizable. However, Gakupo is still quite popular, so either one would've been a good choice. But if either Gumi or Gakupo were to actually appear in any of the main Project Diva games, there would have to be an agreement made between the two main companies. They probably wouldn't appear in more than one game, either. Nonetheless, a lot of fans (including myself) would love to see Gakupo appear in one of the Project Diva games. I hope this could eventually happen some time in the future! But until then, we'll just have to make do with what we have!