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 has 10 white blocks with a red border and 3 yellow blocks. His usual block arrangement are his ten block in a "ten (2x5) and three" position. However, his block arrangement change in almost every episode so it is unclear on what his actual arrangement is. He additionally has mulberry-purple eyes and eyebrows, and mouth

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