User blog comment:Fujiwara No Mokou/Calling all Super Smash Bros. 4 Fans!!!/@comment-25352448-20150403191527/@comment-26208495-20150405220807

While some characters may be included as a joke, all characters included are Nintendo characters, or the -main- mascot of another big-name video game company, from what I understand. Hatsune Miku is a voice synthesizer (although some could argue that she HAS appeared in video games). I don't see her being added, especially for the western audience. But that's my two cents.