【DERIVATIVE】The vocal synths of the hour are the Shion Family.
All derived from KAITO, the Shions are recolors of Kaito that are depicted as his many siblings. The most well known Shions are Akaito (red), Kikaito (yellow), Nigaito (green), Taito (purple), and Kaiko (sister).

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【UTAU】The vocal synths of the hour are Pam & Pamyu.
Pam is a sweet and cute little girl who likes nursery rhymes. Pamyu, originally meant to be a VCV for Pam, is instead her own character—a tiny fairy who represents one of Pam’s ‘possibilities for tomorrow’.

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【VOICEROID+】The vocal synths of the hour are Kotonoha Akane & Aoi.
Akane & Aoi are twins—Akane being the elder, airheaded sister, and Aoi being the younger, gentler sister.

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【UTAU】The vocal synths of the hour are Zuiga Mizuki and Karashine Akito.
Mizuki and Akito are duet partners. They have matching tattoos—Akito’s is on his chest, while Mizuki’s left hip/shoulder.
Their personalities are up to user interpretation.

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【UTAU】The vocal synths of the hour are Sayo and Rine.
Twin siblings. Their personalities are up for interpretation, though Sayo is typically depicted as a cheerful and teasing girl, while Rine is typically depicted as calm and friendly.
Their older sister is Hotoriuta Mito.

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【A.I.VOICE】The vocal synth of the hour is Iori Yuzuru.
Originally released for VOICEROID2, Yuzuru has since released as one of the first synths for A.I.VOICE. He is capable of expressive speech, as well as speaking in a special “Mei” voice.

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【DECTalk】The vocal synths of the hour are the DECtalk voices.
Developed in 1984, DECtalk was a text-to-speech vocal synthesizer. It had a number of built-in voice settings, each that represented a unique character, including Perfect Paul, Beautiful Betty, Kit the Kid, etc.

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【VOCALOID5】The vocal synths of the hour are the VOCALOID5 Standard Vocals.
Developed by the YAMAHA Corporation, these four vocals come built-in with the VOCALOID5 engine. The two English vocals are Amy and Chris, while the two Japanese vocals are Kaori and Ken.

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next you have "the same character, but notably changed" like kotoe and ria (though ria's new design isn't out yet i dont think)
these two type are understandably common for commercial synths, i consider kafu and sekai to be sorta in-between?

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i think the overlap between vtubers and synths is so interesting in how they choose to separate them
first you have "completely different character" types which was done with ZETA ages ago and you now on voicevox/aivoice
tsumugi and nyoki being canon cousins is so interesting

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【SynthV Studio】The vocal synths of the hour are Kotonoha Akane & Aoi.
Originally released for the VOICEROID+ program in 2014, the Kotonohas received a SynthV Studio release in July 2020.

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【UTAU】The vocal synths of the hour are Kakerune Kuu & Kou.
The two are twin siblings, and they each have tail plugs. Kuu, the twin sister, has an outlet plug, while Kou, the twin brother, has a USB plug.

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【VOCALOID3】The vocal synths of the hour are ZOLA PROJECT.
ZOLA PROJECT includes three vocals: YUU, a ‘sweet’ vocal, KYO, a ‘strong’ vocal, and WIL, a ‘husky’ vocal. Because their avatars are image illustrations rather than character designs, their designs can vary.

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【SynthV Studio】The vocal synths of the hour are Kotonoha Akane & Aoi.
Originally released for the VOICEROID+ program in 2014, the Kotonohas received a SynthV Studio release in July 2020.

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【VOCALOID4】The vocal synths of the hour are Otori Kohaku and AKAZA.
Also known as Unity-chan, Otori was released for Unity with VOCALOID. She dreams to star in action video games and movies.
AKAZA is an alternative mascot for unity-chan!, who comes from a dystopian future.

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【A.I.VOICE】The vocal synths of the hour are the A.I.VOICE Announcement Department.
A lineup of virtual announcers, including Yuuki Kaori, a morning info announcer, Hinode Ken a documentary narrator, Shiozaki Kazuki a rookie announcer, and Kazumi Souichi, a veteran announcer.

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【VOCALOID3】The vocal synths of the hour are anon & kanon.
The two are senior highschool students and identical twins—anon being the scatterbrained younger twin and kanon being the responsible older twin.

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