Background
On Iakar, before the Empire arrived, Maldan was the chieftain of his tribe. During the early stages of the Imperial occupation, he resisted as much as he could, but he could not resist the overwhelming might of the invaders, and was pressed into forced labor helping the Imperials harvest the planet's natural resources. One day, Maldan noticed an Imperial officer beating a cousin of his for perceived incompetence. Enraged, Maldan attacked the officer, killing him. As it turns out, Maldan's victim was the son of an Imperial Moff, who asked that his son's killer be brought to him for execution. Fortunately, the ship transporting Maldan suffered a malfunction, allowing him to escape. Though the Empire placed a large bounty on him, Maldan has thus far evading bounty hunters and Imperial forces alike, all the while accruing a larger and larger bounty. Eventually, he met a recruiter for the Rebel Alliance who convinced him to sign up.
Motivation
Maldan's life has been completely uprooted by the Empire. He wants nothing more than to make it pay for all the grief it has caused him.