Numberblocks Wiki

O is the 15th letter in the Alphablock gang.

O is voiced by Lizzie Waterworth.


He is an Alphablock with orange stripes. He has wide eyes and no nose. He sometimes carries a magnifying glass.


O is curious, but not smart. 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.
    • It appears that O sings in English in the DOG part of Frog on a Dog, apparently by mistake. He sings normally in the other parts of the song.
  • O is allergic to dogs, as seen in Cat, despite other episodes claiming otherwise, and also despite O not having a nose.



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