Background
Ohrin was born during the Battle of Umbara during the Clone Wars. He grew up in the aftermath. His mother was killed in the battle and he was raised by his father. His father was of Nevil Cygni's insurgency that fell to Grand Admiral Thrawn. Ohrin's father died during the final battle and Ohrin was left to his own devices. He hated the Empire for what it had done to his planet and his people and sought any opportunity to strike back at them. He was young, but grew up on the battlefield and found the Rebel Alliance through his bouncing around various mercenary and underworld groups.
(The Searching Insurgent)
Motivation
Freedom- He wants to see Umbara free primarily, but a free galaxy would be a bonus as well.