Numberblocks Wiki
Numberblocks Wiki

O is the 15th letter in the Alphablock gang.

O is voiced by Lizzie Waterworth.


He is a Alphablock with orange and yellow stripes and a glass helmet that with the letter "O".


He is mostly curious, but not smart, and carries a magnifying glass. Unlike other Alphablocks, he only says the "O" sound, either short or long, and also his name.



  • O is the only Alphablock without a nose.
  • His “long vowel” episode is Home.
  • O is the only Alphablock who only says his sound, long or short, and his name, in every episode he appears in.
  • There are some episodes where Alphablocks only say their sound like O.
    • Some of them have Alphablocks who don't speak or have no solo lines when they're outside 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.
    • It's unknown why they still have a nose when they do so.
  • There are some episodes where O doesn't speak when he's outside of word magic (ex. Sleep.)
  • He's the only Alphablock who communicates in another language.
  • It's unknown if there'll be an episode where O can finally speak English.
  • O is allergic to dogs, as seen in Cat, despite other episodes claiming otherwise, and also despite O not having a nose.
  • O can say ochoo



Alphablocks characters

Main Characters

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z


Magic E, Plusman