Andrew Mulligan is Little Bill's best friend and he loves to have fun. Andrew is a 5-year-old boy. When Andrew's family moved two doors down from Little Bill, they became fast friends. Andrew is as good at playing make-believe as Little Bill, and both boys share a love of adventure and Captain Brainstorm. Andrew has two older cousins, 11-year-old Rachel and 13-year-old Kevin, who sometimes visit and play with Little Bill, April, and Bobby. He likes Captain Brainstorm like Little Bill does.
Andrew is a ginger with a crack addiction and he always gets bullied and really wants to shoot up the school but his parents won't let him
Andrew has fair skin and red hair with red freckles. He wears a grey shirt with a blue vertical stripe, blue jeans, and white sneakers.
TriviaEditIt is possible that he is Irish-American due to his last name and orange hair.