Something about formant and vocal synthesis that gives me a warm and fuzzy feeling.
I'm really putting this as a place holder for.myself here as time is freeing up and I'll have a long awaited dance with the SDK. Aside from a few other ideas, I might.play with this idea more.
https://klevgrand.se/products/jussi/
The above link is some inspiration from a newly released VST. I particularly.like their use of turn-in (slight pitch shift that follows the envelope).