When Darth Aeternus does things, he makes sure everything is done correctly, no matter how long it takes. This means there are frequent delays in Darth Aeternus's work, but it's usually done right, at least.

Through a combination of preparing, studying, and analyzing, Darth Aeternus creates detailed battle plans and tries to think two steps ahead of the enemy. At times, however, this can lead to Darth Aeternus creating complicated schemes that can baffle less intelligent subordinates.

Darth Aeternus tells it like he sees it, when he thinks it; and he doesn't try to sugar coat what he says.

While generally laid back and more than happy to offer a quip of sarcasm, Darth Aeternus's entire demeanor changes once combat begins. He becomes focused and quiet, with his smile replaced with a look of grim determination.

Darth Aeternus is utterly devoted to success in combat, no matter the mission, no matter the cost. He has spent his life building himself in the image of war, utilizing a dogmatic regimen that has lead him to a single-minded obsession with military success and requires intense physical and mental training. This training, however, has come at the cost of anything resembling empathy or concern for others - even his superiors and subordinates.

Darth Aeternus doesn't like to kill people; instead he chooses to injure his opponent until that person is unable to fight back or is otherwise incapacitated.