O is the 15th letter in the Alphablock gang.

O is voiced by Lizzie Waterworth In UK And Ethan Kempner In the movie.

Name: O

Birthday: October 24, 2007 File:One.png

Age: 3

Gender: Male

Personality: Curious

Colour: Orange


He is an orange block. His eyes are wide opened. With no nose. He does not speak.


O is mostly in mute, only communicating with his sound, but he is very curious and loves to investigate things with his trusty magnifying glass. He can say his sound but that doesn't stop him from seeing stuff from his O-shaped magnifying glass. O is the only Alphablock who is orange. 


  • O is the only Alphablock who only says his sound, and his name, in every episode he appears in.
  • He is also the only Alphablock who has no nose .
  • There are some episodes where Alphablocks only say their sound everything.
  • He is the only Alphablock who does not talk.
    • Some of them have Alphablocks who does speak or have solo lines when they're inside of word magic.
    • Some others have Alphablocks only saying their sounds as their solo line.
    • Some others have Alphablocks saying their sound when they're not in a word.
  • There are some episodes where O says his name when he's inside of word magic (ex. Sleep.)
  • He's the only Alphablock who communicates by saying his sound.
  • It's not unknown if there'll be an episode where O can finally speak English.
  • O doesn’t just say O in the ABC episode on alphablocks when N said No! When he said oh he said oh! Not O


  • Little Miss Curious (Mr. Men) - Both are orange and curious.
  • Beaker (Occasionally on Muppet Babies) Both are orange and can only say one thing.
  • Kenny McCormick (South Park) - Both are mute.
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