Name: 21 Gender: Female Personality: Loves discovering new things and has a strong sense of adventure. Symbolic Colors: Light orange, Red Symbolic Number: 21 Description: An explorer Numberblock and the first compound Numberblock to gain her own identity. She often appears helping other Numberblocks find their own identities. Since she is 7x3, she wears a hat with three rainbow-colored feathers. As a triangular number, she can transform into a step shape and wears boots.

Name: 22 Gender: Male Personality: Lively and energetic Symbolic Colors: Light orange, Orange Symbolic Number: 22 Description: The second Numberblock to gain an identity after 21. He can split into two 11s, which appear as red and blue respectively. This allows him to play a game of soccer by forming two teams all by himself.

Name: 23 Gender: Male Personality: Self-assured and gentle Symbolic Colors: Light orange, Yellow Symbolic Number: 23 Description: He has purple eyes and limbs but is a prime number that cannot form many rectangles. He looks similar to 29 and is satisfied just being himself.

Name: 24 Gender: Female Personality: Kind, positive, and bursting with energy Symbolic Colors: Light orange, Green Symbolic Number: 24 Description: She has more rectangular forms than 12 or 18, earning her the nickname "Super-Duper Rectangle." Her appearance is similar to 12 and 18, with rectangular eyes and a watch on her arm, but her eye rims and limbs are blue. Since a day has 24 hours, she sometimes carries a staff shaped like the sun and moon.

Name: 25 Gender: Female Personality: Mature and full of pride Symbolic Colors: Light orange, Blue Symbolic Number: 25 Description: She has five jagged, gear-like eyelashes above her square eyes. She is the 5th square number and often appears as a 5x5. She was the third among the 20s to find her identity after 21 and 22.

Name: 26 Gender: Male Personality: Quiet and reliable, like a secret agent Symbolic Colors: Light orange, Purple Symbolic Number: 26 Description: He wears sunglasses. He can split into two 13s and is employed by 15 to work as a secret agent alongside her.

Name: 27 Gender: Female Personality: Bright and friendly Symbolic Colors: Light orange, Rainbow colors Symbolic Number: 27 Description: A Super Cube that can form a 3x3x3 cube shape. Excluding 1 and 8, she is the founder of the Cube Club. She didn't have her hexagonal mask when she first gained her identity, but she began wearing it from the very next episode.

Name: 28 Gender: Female Personality: Artistic and loves creating patterns Symbolic Colors: Light orange, Pink Symbolic Number: 28 Description: A Numberblock shaped like a window with holes, and the 7th triangular number. Since she is 1+2+3+4+5+6+7, her triangular step mask is rainbow-colored. She is the pattern creator among the Numberblocks.

Name: 29 Gender: Male Personality: Very social Symbolic Colors: Light orange, Gray tones Symbolic Number: 29 Description: He loves clubs. He has created new Numberblock clubs, such as the 'Ends in 9' club and the 'Square with a Hole' club. He also hands out club badges. He looks similar to 23, who is also a prime number.

Name: 30 Gender: Female Personality: Loves entertaining others Symbolic Colors: Light yellow Symbolic Number: 30 Description: Composed of three sets of ten light yellow blocks with yellow borders. She appears as 10+10+10. She is a giant version of 3. She wears a circus hat and carries juggling balls with '10' written on them. Interestingly, if she takes off her circus hat and throws it on the ground, it turns into a circus ring.