I might implement each backstory for each character in this, but that would take a while so here’s Voltage’s backstory:

Before he entered Earth in 2014, He was chilling in Gibios until an asteroid crash-landed in the surface, He investigated the wreckage, releasing a pack of Shadow Scavengers and Shadow Raiders to attack the place, Voltage acted fast and he defeated them all, He doesn’t know what they want or who they work for, But then he travelled to Earth in 2016 to protect it from the shadows he saw, Until he gets captured by Device’s Soldiers, He didn’t have time to escape until he was tranquilized, As soon he discovered Device’s plan of “Saving the world” He stated that destroying them could end the universe, But he didn’t believe that, So he managed to escape the cage and punched him square in the face, making his way out of his RV, Not until mysterious people tried to capture him and trying to sell him to the blackmarket, He fleed day by day to avoid strangers, But then he stood up, He fought back from the people who tried to capture him, And then he met Mohawk, who was also in the mood of capturing him, They fought all the way to an old abandoned town, but Mohawk was defeated, while Voltage was frustrated from all the things he encountered, Til this day he avoids unknown people so that he doesn’t end up in the same situation he got into, He will fight back if needed to…

This will explain why Voltage will attack Squi and Radon or maybe Milky in Episode 2