History of Main Characters

This is a breakdown of the series and the leading protagonists in each.

Dragon Ball Zero
Goku, Gohan, Piccolo, Goten

Dragon Ball X
Goten, Gohan, Seventeen, Vegeta

Dragon Ball NG
Ryder, Bryan, Alex, Trunks, Goku

Dragon Ball Wars
Alex, Bryan, Chibi

Dragon Ball Aftermath
Alex, Nick, Chibi

Unspecified Series
Darrius, Jade, Rory, Jane [details not finalized]