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"I don't think I've seen Thirteen (character) before!"Four
This page is about the character(s). For the episode, see Thirteen (episode).

Unlucky me!

— Thirteen

Thirteen, or 13, is a Numberblock made up of 13 blocks. He is voiced by Marcel McCalla.

He is a clumsy and unlucky Numberblock who is very prone to accidents and trouble.


Thirteen is made of 10 white blocks with red borders and 3 yellow blocks. He has maroon eyes, lips, eyebrows, and limbs.

Featured in his debut, Thirteen occasionally wears a boater hat. The ribbon matches the scheme of his block colors. He also wears a spotted bowtie in Fifteen's Minute of Fame, similarly resembling his block colors.


As a reference to the superstition, Thirteen is an incredibly unlucky Numberblock, commonly falling into accidents and splitting into Ten and Three upon hearing his name. Despite his accident-prone nature, Thirteen attempts to make light of his situation, commonly resorting to humor and turning his unfortunate problems into comedic, playful situations. He appears joyful and friendly, often admiring the talents of others and playfully joking around with his friends. Thirteen is also very sweet-natured, never responding with anger to mistreatment and instead focusing on helping others.

Despite typically laughing his unluckiness off, Thirteen is shown to be heavily impacted by the actions of others, often expressing sadness and disappointment when he is subjected to anger and frustration. He is also shown to be more anxious and fearful in more serious and problematic situations, often straying to the side rather than actively participating. Notably, he still also expresses stress and sadness when others say his name unnecessarily and is frequently shown worrying about his unluckiness.

Episode Appearances


It is debatable whether Thirteen (don't say it!) has a default arrangement, as his arrangement changes almost every episode he appears in. However, his three most common arrangements are 2R+3+(2x4)L, 1R+3x4, and (2x2)L+3x3.

2D (39/1,903,890)



  • 13's numeral means:
    • 7 in Quaternary.
    • 9 in Senary.
    • 11 in Octal.
    • 15 in Duodecimal.
    • 19 in Hexadecimal.
      • In the hexadecimal system, the numeral for 13 is D.
  • Thirteen usually gets a new arrangement whenever he splits and adds back up, so he doesn't really have a default arrangement. However, his three most common arrangements are 2R+3+(2x4)L, (2x2)L+3x3, and 1R+3x4.
  • Although Thirteen splits upon hearing his name spoken verbally, he does not split when seeing it written down, as confirmed by his debut episode.
  • He is the only Numberblock from 11-20 to not have one of his arrangements be "Ten and (x)" during his debut episode. 12 and 16 don't start out in their "Ten and (x)" arrangement at first, but rearrange to such position.
  • In "Flights of Fancy", 13's planet is one filled with echoey caves that allow his name to repeat. This implies that 13 likes his trait where he splits into 10 and 3 when he hears his own name, at least in a controlled environment.