One is a character in Numberblocks with only one red block. She first appears in her titular episode, and last appeared on Space Division.

Appearance

One is made up of 1 red block. She has one maroon circular eye and mouth. She also has a gradient that goes from red to maroon limbs.

Learningblocks.tv Description

Numberblock One is the first little block that ever there was.

She’s the smallest and the bravest, has lots of ideas and is always first to come up with a plan.

Numberblock One is bright red and has one block and one big round eye. 

Annual 2022 Description

One loves singing about things that are on their own.

Her best friend is Numberblock Two.

Episodes

One appears in every episode except these 25:

• Building Blocks

• The Way of the Rectangle

• Loop the Loop

• Twenty

• Sign of the Times

• Fun Times Fair

• Divide and Drive

• Two Times Shoe Shop

• How Rectangly!

• Rectangle Racers

• Four on the Floor

• Sky High Fives

• Heroes With Zeroes (icon only)

• Double Back

• Ten in the Bed

• Shape Party

• Octoblock and the Path of Justice

• Friendly Fours' Beach Day

• All-Star Line-Up

• Rescue Racers

• Remix the Sixes

• Grid Games Galore

• The Rainbow Makers

• Sail the Seven Seas

• The Magical Nines

Total number of appearances: 133 + 1 (including pictures)

She has appeared in 85.44% of Numberblocks episodes, including the crossover specials.

Arrangements

One is just one block. She has only 1 arrangement, but currently she has 2 forms.

Two-Dimensional (1/1)

Other (1)

Trivia

• She and 0 are the only Numberblocks that have all dimensions at once.

• One is the first Numberblock to not be made of other Numberblocks, the second being Zero.

• One was the first Numberblock to be seen in the show.

• She and One Hundred are the only cyclops characters.

• One was also the first Numberblock to speak in the show.

• As shown in the comic One, One was originally white with black limbs and two eyes that resemble the eyes of several females from Alphablocks. Her Numberling was also in serif font.

• One is the first square number, cube number, triangle number, and polygonal number to appear.

• One has the most copies shown in one scene at 101.

  • Her previous records were 100 and 40 respectively.

• In the Alphablocks episode UFO, an alien with a “one” on top appears during the episode. Alien One looks incredibly similar to the One we know and love. Both have one eye, a number one on their head, and are complementary colours with the aliens being green and our One being red.

• One is one of the many Numberblocks to appear in different colours. The others are Numberblocks Two-Nine and Eleven.

• One sometimes has a square eye, as seen in the episodes Square Club and Steps Versus Squares.

• She is the first character voiced by Beth Chalmers.

• With one (visible) eye and a red, blocky body, she looks like Alphablock R.

• One has an alter ego as a great detective in two episodes.

• One and Colourblock Red are similar in many ways.

  • They are both the colour red.

  • They are both the first character introduced in an episode.

  • They both appear in an episode by themselves.

  • They both fell from the sky.

  • They both appeared in the premieres of their respective shows.

  • They are both females.

  • They are both bubbly, curious, sweet and childish.

  • Their first lines are similar.

• One and Alphablock A are also similar in many ways.

  • They both appear with apples. (One counts apples, A gets hit with them, and they both eat them.)

  • They are both the first character introduced in an episode.

  • They both fell from the sky.

  • They both appeared in the premieres of their respective shows.

  • They are both females.

• One physically appears in the most episodes of Numberblocks as of Series 6.

  • Interestingly enough, One wasn't always the Numberblock appearing the most. During a very long period of time, Two was the Numberblock appearing the most instead.

• One can jump to a height of 14 blocks, as seen in Snow Day Doubles.

• One can jump to a height of 52 blocks using a bouncer, as seen in More To Explore.

• One is the smallest Numberblock when it comes to physical sizes, not including Zero. However, if fractions would appear, they would be smaller in size than both, even though they are greater in number than zero.

• Out of the main ten, One has the biggest eye. She is also the only main character with one eye.

• Sometimes, One counts objects by one and gets interrupted, as shown in One Hundred, More To Explore, What's My Number?, and Rockets and Rekenreks.

• One is the only Numberblock to use E’s megaphone.

• Unlike most squares, One is different from them. One has one round eye, while other squares have two square eyes. One also appears not to have any super strength like the other squares, or have any special interest in squares.

  • One and Four are the only squares that can’t sneeze, likely due to them not having some blocks in the middle.

  • One, unlike other squares, is not scared of round things.

• Out of all Learningblocks characters, she, Zero, and the What-Iffer have the least amount of eyes.

• Not counting Zero, she has the least arrangements out of every other Numberblock.

• Properties:

  • Triangular Number (Step Squad, Up to just 1 block)

  • Square Number (1 × 1 = 1, 1² = 1)

  • Cube Number (1 × 1 × 1 = 1, 1³ = 1)

  • Polygonal Number

Related Characters

Orders of Magnitude

• Ten

• One Hundred

• One Thousand

• Orders of Magnitude

Other

• Two (best friend)

• One Times Table

Error

• In One's episode of the "MI15 Fact File"[2] series uploaded by the official YouTube channel, One used to be listed as a member of Prime Club, even though One isn't generally considered a prime. This was fixed shortly after.