Both Reimu, Marisa, and Nazrin use actual voices cut up into parts. Some are betteer than others, though, because of time constraints, since I did everything apart from the art on my own. Reimu and Marisa use samples taken from the Musou Kakyou anime.
Making the noises intelligible enough to not be too annoying and also not coherent enough to form random words was a huge challenge though, so I'll probably update it at some point.