These characters become available as stage points are achieved.

Code - Effect

Arnold - Earn at least 30,000 pts in Shiverpool 2
Big Z - Earn at least 100,000 pts in Legendary Wave
Elliot - Earn at least 40,000 pts in Pen Gu North 3
Geek - Earn at least 60,000 pts in Pen Gu South 4
Tank - Earn at least 40,000 pts in the Boneyards
Tatsuhi - Earn at least 15,000 pts in Pen Gu South 2