Theory Yumeiro
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Image by Matsuda Toki

Western Name: Theory Yumeiro (Theo)
Eastern Name: 夢色Theory (Theo)
Kana Pronunciation: ゆめ-いろ-せおり

Gender: Male (presumably)
Age: Unknown

Release Date: February 14, 2017
Group/Team: UTAU Human Project (UHP)

Official Site


Technical Details

Voiced by: Kuro Cure/Hello Chainsaws
Managed by: Kuro Cure/Hello Chainsaws

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Voicebank Distribution

Starling (DISCONTINUED)

  • Quadpitch for each tone: A3, D4, G4, C5
  • Appends: Regular (default), Whisper (W), Strong/Clear (C), and Power/Shout (S)
  • Extras:
    • End breaths (all tones and pitches),
    • Breath out + in (all tones and pitches)
    • Vocal fry (CVVC; Regular at A3, D4, and G4 only)
    • Glottal stops (all tones and pitches)
    • Growl (CV at E4; add G)
  • Recommended resamplers: tn_fnds (optimal; no flags needed), Fresamp (B0Y0H0F1), EFB-GT (no flags needed), TIPS (B0Y0H0F1)


Terms of Use

R-18 Content Allowed? Forbidden
Commercial Use of Voicebank Allowed? Permission Required
Commercial Use of Character Allowed? Permission Required
Do these terms apply to derivative characters/voices? Derivatives of any sort are forbidden
Click here to view the terms of use for this UTAU.
[* Click here to view commercial license info for this UTAU.]


Voice Sample(s)


Character Details


Height: 5'1" / 155cm

Weight: 70lbs / 34kg

A rather enigmatic young boy. Although his past is a mystery, he seems to have memories dating back to the 1600s.

Despite his young appearance, he is polite, doting, and acts somewhat like a parental figure towards friends and loved ones. He gets along well with children, though he has a tendency to treat adults in the same manner, referring to them as "cute" and offering them sweets.

Likes: Sweets, coffee, tea, fables

Hates: God, religious hymns

Personality: Amicable, doting, laid-back, motherly/fatherly, mischievous

Relatives: Sakasa Shiki (little sister)

Friends: Hibiki Kazuhiko (love interest), Iwata Tarou, Chris, Velveteen, Denatsu Sora

Enemies: God

Trivia: His motives are unknown.


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Image by Kuro Cure

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Image by Tokkiria

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Image by minome & Kuro Cure

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Image by Tokkiria

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Image by Matsuda Toki

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