The is from the Numberblocks
 series, Numberblocks are like humans but they have a floating number in their head and can be added, in this case thirteen is thirteen, He's a sweetheart,  clumsy and unlucky Numberblock who is very prone to accidents and trouble.

Personality and Traits
As a reference to the superstition, Thirteen is an incredibly unlucky Numberblock, Thirteen attempts to make light of his situation, commonly resorting to humour and turning his unfortunate problems into comedic