Name: 11 Gender: Male Personality: Passionate and active Symbolic Colors: White, Red Symbolic Number: 11 Description: He loves soccer. He is set to love soccer because there are 11 players on a team. He wears soccer cleats and turquoise pants.

Name: 12 Gender: Female Personality: Calm and rational Symbolic Colors: White, Orange Symbolic Number: 12 Description: The first Super Rectangle, she possesses a watch called the 'Array Display'. She has rectangular eyes. She meditates occasionally and teaches other Numberblocks how to form rectangles. She even created a separate place for meditation and training. She is depicted as siblings with 18. (However, it is unknown who is the older or younger sibling.)

Name: 13 Gender: Male Personality: Clumsy but positive Symbolic Colors: White, Yellow Symbolic Number: 13 Description: Perhaps because 13 is considered unlucky in Western culture, he has very bad luck. Whenever his name is mentioned, he splits into 10 and 3. Because of this, he is sometimes called 'Ten and Three' instead of 'Thirteen'.

Name: 14 Gender: Male Personality: Energetic and lucky Symbolic Colors: White, Green Symbolic Number: 14 Description: He loves skateboarding. His skateboard is rainbow-colored and can split into two. When it does, he says "Double Lucky Seven!" He has rainbow eyebrows and wears a helmet.

Name: 15 Gender: Female Personality: Quiet and mysterious Symbolic Colors: White, Blue Symbolic Number: 15 Description: A secret Special Step Agent who can stealthily hide in a staircase shape. She can split into 1, 2, 3, 4, and 5 to become a Special Step Squad and solve problems with a five-step plan. She wears a white boot on one foot and a blue one on the other, along with a blue triangular step mask. She runs the Number Base, specifically 15's Number Lab, located on the 15th basement floor. She is a master of disguise and stealth.

Name: 16 Gender: Female Personality: Bright and cheerful Symbolic Colors: White, Purple Description: A square made of four 4s. She is the founder of the Square Club and loves partying. She has square eyes, purple limbs, and can split into four 4s wearing hats. She occasionally makes oinking sounds, which seems to have become a habit.

Name: 17 Gender: Male Personality: Pure with a great artistic sense Symbolic Colors: White, Rainbow Symbolic Number: 17 Description: A painter-themed Numberblock. He has a compulsion to draw exactly 17 of every object when he paints. He walks around with paint stains on his blocks. When he first officially appeared, 3 had a very hard time because of that.

Name: 18 Gender: Male Personality: Impatient and loves speed Symbolic Colors: White, Pink Symbolic Number: 18 Description: A speed freak who is impatient and loves anything fast. He is the second Super Rectangle and loves flying on light beams at high speeds. He is depicted as siblings with 12. He sometimes makes strange voices or weird faces (like ㅁVㅁ). As a side note, he once raced 24 on light beams and lost by a single block. It is unknown which of 12 and 18 is the older or younger sibling.

Name: 19 Gender: Female Personality: Shy but bright and self-loving Symbolic Colors: White, Gray tones Symbolic Number: 19 Description: She can make many unique shapes with her blocks. Since she is a prime number and cannot make many rectangles, she used to envy 18, who could form many rectangular shapes. She has zigzag eyebrows that are gray on the left and black on the right. Seeing that she can make many shapes, she calls them 'One-Nine Shapes'. She always carries a red pencil-shaped pen.

Name: 20 Gender: Male Personality: Gentlemanly Symbolic Colors: Light Orange Symbolic Number: 20 Description: Consists of 20 light orange blocks with an orange border. The border divides 20 into two 10s. He is a giant version of 2, wearing purple glasses like 2 and loving to dance. His limbs are orange, and he wears shoes, a hat, a bowtie, and carries a cane. He can split into two 10s to dance the tango or ten 2s to tap dance.