Jack is a ring-tailed lemur who stands by Smol Beach's entrance on Sheo Island to inform Joe (and most likely anyone else that walks by) about the news van blocking the passage. His fur is white with dark grey markings around his tail and on his face with a red rhombus shaped marking on his chest. His outfit is a simple pair of black coveralls, indicating that he is a mechanic.
He expresses his wish to just take a break as he's working to fix the blockage problem.
As of version 0.18.500, by the time Joe gets to Smol Beach and gains access to Lood City on his own, Jack will have finished repairing the van allowing Joe to use Smol Beach as a shortcut between Lood City and Sheo Island. Jack will inform Joe of such if he is approached again after the van is gone.
As of version 0.18.500, Jack also has an additional scene added onto his main sex scene in which he switches positions with Joe.