I have been following this project for at least 3 weeks now, and I'm excited to see this completed. I have played the demos both using keyboard and mouse and using the Vive.
It's either the player is too short or Shinobu is too tall. I'm pretty short at 158cm, but I know I'm not shorter than her loli form. Also, her skirt glitches after moving a lot. Restricting its sway might be a fix. As for interactions, it would be nice if she had an attention span so she won't be amazed at her picture the whole time. Waving using the Vive isn't working, but I'm guessing it's not yet implemented.
Overall, this is stable and well-done. Keep it up!