What are the actual effects of these? I get the description, but in game terms, how do them impact loyalty etc?
Hated Occupier: This leader will apply Martial Law with extreme severity in any rebellious city he has to pacify.
Occupier: This leader will not hesitate to proclaim Martial Law in any rebellious city he has to administer.
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[EDIT]
Actually found a post with the details:
Occupier
When commanding a stack, this leader will proclaim Martial Law in any rebellious city, raising or lowering the city loyalty by 5/trn up to 60% loyalty, if the city loyalty is below 90%.
Hated Occupier
When commanding a stack, this leader will enforce Martial Law with extreme severity in any rebellious city, raising or lowering the city loyalty by 5/trn up to 50% loyalty, if the city loyalty is below 60%.
So, the trait is mostly positive. In rare instances, it can be negative as well. You do not want people proclaiming martial laws in loyal regions. People do not like that...