I don't embark on evil biomes.
Also I tend to get quite protective of the important dwarves here, including the starting seven. One of my military is wounded, or legendary craftsman ? I can spend months watching him over the hospital, removing and adding beds so he gets healed soon.
I care enough to give good, high-value meals and alcohol variety to dwarves, and a decent dining room and a bed at least. Sometimes an individual room for everyone, as well as a coffer and cabinet. So if you have useful skills, you are welcome and you will live well.
I also generally never cheat no use violence with dwarf and human merchants, excepted if they're getting too greedy. Most of the time elves are also good training partners, as long as they bring wood and interesting exotic animalss. a
I also have a soft spot for cats, and tend to cage them or sell them rather than killing them now that I'm in 0.31.
But most of the time i'm the classic evil overlord. Killing migrants because there are too much or they are entirely useless, incinerating goblins in magma (or using them as targets), slaying every kobold I can generally in a brutal way, murdering nobles (the useless ones only !) or just letting them die on purpose, letting really stupid dwarves die because of their stupidity, and other dog-kicking for pragmatism's sake. Also, burning animals in magma to fix FPS.
I never do something for the sake of being evil though.