Rogh Deyo was once a slave. He was freed at the age of 16, but being a slave meant that he was a broke boy. He borrowed money from the Hutts and is now in debt. He has a contract to work for them until his debt is paid off. The Hutts force Rogh to be apart of a crew of insane criminals for work.
Rogh prefers to handle conflict through negotiation, only resorting to violence if necessary. He learned his negotiation skills from bartering in markets as a slave.
Before he began working for the Hutts, he tried his best to help out the less fortunate because he felt sympathetic towards them due to his rough history.

The Weak / Charity: The character fights for the underdog, disliking bullies and totalitarianism. They'll put the interests of those in need before their own and may donate time or money to aid the less fortunate.
Non-Human Rights: The character fights for the rights of non-humans in the very xenophobic rule of the Empire.
Emancipation: The character sees slavery and indentured servitude as an abomination that must be undone. They'll go out of their way to aid or attempt to free anyone kept in slavery.
No Collateral Damage: Though some particularly pernicious bounty hunters are willing to toss around thermal detonators on populated worlds, most try to minimize the civilian harm they cause, if only because it can be inconvenient to clean up. A few. however. are scrupulous about avoiding civilian casualties. to the point of letting a target escape to avoid hurting civilians.

Contract: A powerful and strict contract binds the character to a specific employer. This could be a crime boss, an Imperial courtier, or a wealthy corporate CEO. Whoever holds the character's contract has nearly total control over the character's future career. All bounties are furnished by the contract holder, and deviating from the terms of the contract can lead to a number of potentially harsh fines and punishments.
Debt: The character owes quite a bit of money to one or more individuals. This could be money owed to a shipyard for some expensive modifications done to the character's ship on credit, or funds put forth by a patron who backed the character's entry into the bounty hunters' guild and expects to be repaid or services rendered.

He wears a cowboy hat but nobody in the Star Wars universe knows what a cowboy is so nobody understands his hat. Including Rogh Deyo himself.