Thirteen is the thirteenth number. Thirteen is a boy.

Thirteen is an incredibly unlucky Numberblock, commonly falling into accidents and splitting into Ten and Three upon hearing his name (or hearing it through the fourth wall).

Despite his accident-prone nature, Thirteen attempts to make light of his situation, commonly resorting to humour 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.

Numberblock Thirteen is white with red edges and three yellow blocks.

You will first see him in Thirteen.