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So, Hoshi's V4 vb has three appends, so you may want to write that, and their suffixes. Whisper uses Teto Whisper's suffix, and Power uses P. Hoshi CVVC (now CVVC+) has a monopitch F3 whisper bank, which I believe uses W suffix.
If you'd like to make a wiki page for him now, Kari has an UTAU Wiki 2.0 page you can reference: http://utau.wikidot.com/utau:kari, as well as a showcase page for his English voicebank. However, if you'd prefer to make pages for other voicebanks currently, I'd be fine with that!
I'm setting up an UTAU wiki via Mediawiki (the Wikipedia software) for a more quality-controlled space. You can submit your UTAU and, after testing that they're functional and released, I'll write a wiki page for them to ensure they follow the same standards.
PIERO's substitute voice provider sounds a lot older than me. By the time his new VBs are all out he should be about 14-ish, but I'm wondering if I should bump it up to 15-16.
I hope you do well next year. Do you plan to keep homeschooling?