Jack

if your looking for SpongeBoy's cousin then see   Blackjack  

Basic Information
Jack m. Jefferson is one of the Major characters in SpongeBoy Ahoy. he mostly appears at the japari cafe and eating at the krusty krab eating kraby patties wit Baby John. he is a part of the japari lodge and he first appears in the episode Naughty Nautical Neighbors. he can ride skateboards and scooters and invented moves as well. his brother baby john is a small baby who often destroys objects and his cousin Mr Beast is always visiting them every summer and gives them ten-thousand dollars every time he visits.

Appearance
He mostly appears wearing a red T-shirt navy blue pants and sometimes wearing different clothes in the episode  Japari Cafe  he is seen in a Blue Jacket and Blue T-shirt. He is orange-haired like baby john.