|Family and Relations||Mary (Younger Sister)|
|Voice Actor||Sota Arai|
|First Appearance||Amazing! Robot Girls Z|
Jack first appeared with Mary running their mobile donut shop until the cart was destroyed by Z-chan in battle with the Mechanical Beast Girls which happened quite frequently in later episodes. He later appeared with an ice cream cart at the Battle Athletes competition giving out ice cream as Z-chan won the race until his cart fell down with the appearance of the Daiku Maryu. Jack and Mary would continue to show up selling their goods until their cart was destroyed by whatever came their way or would appear at places like a hot spring resort.