Magic E (SuperHero)
Magic E is E wearing a top hat and black ninja clothes. Unlike Silent E, he can actually TALK. Apparently, his magic hat "can make a vowel make a different sound", particularly, make the Alphablocks "say their name". An example is: Tune.
Silent E (Hero)
Plusman only appears in Plusman. He is similar to X, but he is red and orange instead of blue and yellow. Also, his letter top has a plus sign instead of an X. He can put two words together to make a compound word.
The One One (Hero)
The Terrible Twos (Villains)
Two Numberblocks Twos who are divided from Four, and appear in the episode The Terrible Twos. Their mask colors are blue and purple. They love to tickle Numberblocks, who laugh (or possibly sneeze if it were a 9) and then get scared by the Twos. They get so scared they split into Ones. They are the product when Four cannot even decide and is the only actual square root who is not named "The (X) (X)s".
The Three Threes (Anti-Villains)
Three Numberblocks Threes who are divided from Nine, and appear in the episode The Three Threes. They have three different mustaches and are acrobatic. One time they help One open a jar of honey. However, in Square Club, they totally didn’t help the others but were just juggling balls. They also made an cameo in Mirror, Mirror (does not shown mustaches) and Divide and Drive.
The Four Fours (Hero)
Four Numberblocks Fours who are a result of Sixteen splitting in half into two Eights then into the Four Fours. They all have the same Barbershop hat with the green ribbon wrapped around it. They Appeared in Square Club (But at the last notice was scared by The Balls the were holding) then They Try to Call The Three Threes, but they totally didn’t help them.They also made a cameo in Divide and Drive.
The Five Star Fives (Hero)
The Big Bad Square (Villain)
Octoblock is the result of Eight being tickled by a radioactive octopus. His catchphrase is 'Octoblock, (command)! 1, 2, 3, 4, 5, 6, 7, 8, (said command)!
Octonaughty is the result of the Terrible Twos duplicating themselves and then combining. He is Octoblock's villain counterpart and his catchphrase is "Octonaughty, (command)! 8, 7, 6, 5, 4, 3, 2, 1, (said command)!". Octonaughty has a higher voice than Octoblock.
Step Squads (Hero)
- 15: 1+2+3+4+5
Then Fifteen tells the other triangular numberblocks (1, 3, 6 and 10) that they can also make Step Squads.
- 1: 1
- 3: 1+2
- 6: 1+2+3
- 10: 1+2+3+4
The Step Squads can help other Numberblocks or other things and animals from accident.
Appear episode: Step Squads
The Terrible Twenties (Villain)