Theory Amadeus Liddell Yumeiro
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Image by Matsuda Toki

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

Gender: Male
Age: 12

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

Latest Voicebank! Demo Reel embed below!


  • 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)

~A natural singing voice that can, with the additional tones, be tuned realistically and emotionally~


  • Tripitch: G3, E4, A4
  • Appends: Strong at A4 (C), Whisper at E4 (W), Dark at G3 (D), Falsetto at A4 (F), CV Edge at A3 ('), and the Natural higher range at B4 (↑)
    • Each append is one pitch and recorded in the pitch according to its optimum range, coinciding with the core pitches
  • Usage tips:
    • Recommended resampler is Moresampler, however tn_fnds is also good
    • Flags may differ for different tones, but default flags are Mo10Mb-10Mt-25
    • Use of positive gender flags above the value of 5 is not recommended
    • Oto was generated in moresampler
    • He is geared for experienced tuners, but he is also beginner-friendly


  • 4-pitches: G3, A3, E4, B4
  • Recommended resampler: TIPS


  • Voicetype aimed to imitate Sukone Tei's tone. The voicer asks not to refer this voicebank as Sukone Tei.
  • Monopitch at E4 with various extras including vocal fry, glottal stops and end breaths (extras are unoto'ed)
  • Recommended resampler: tn_fnds

Terms of Use

R-18 Content Allowed? Permission Required
Commercial Use of Voicebank Allowed? Permission Not Required
Commercial Use of Character Allowed? Permission Not 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

Likes: Sweets, expensive foods, physical activity, nature, animals, 逆さ指揮 (Sakasa Shiki, cousin), 夢色刃先 (Yumeiro Hasaki, brother), making new friends, books, music, exploring, toys
Dislikes: Being alone, bad food, bullies


  • His favorite food is caviar
  • His character is inspired by the character Alice (Alice in Wonderland)
  • He is capable of speaking both Japanese and English, though he's always learning Japanese from Shiki or Hasaki, his housemates
  • When he speaks English, he has an English accent
  • He tends to be obsessive
  • He's mischievous and tends to need a lot of stimulation or else he gets into trouble (he has a natural talent for getting into things he isn't supposed to)
  • He can run at speeds of up to Mach 2 for very short bursts and lift objects vastly heavier than himself; you do not want to make him angry
  • He can be a brat and throw tantrums often but he usually doesn't bear grudges
  • He has a companion named Finley, a small flying creature that resembles a teru teru bozu
  • If there's someone or something he admires, he will attempt to mimic it
  • His ultimate goal is world domination

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Image by Kuro Cure

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Image by Ria

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Image by minome & Kuro Cure

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Image by Kuro Cure

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Image by Kuro Cure

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