Pleasant
The soul of the Death Star is actually quite pleasant. And if you think about it, it's the people who control the Death Star that are evil and kill.
Picture the Death Star in your mind. As you picture it, its pleasant, smiling soul floats up and out of it. "Oh hello, dear," it says happily, "Didn't see you there!"
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The pleasant soul within the Death Star actually looks like a yurt (ゆ), not a big angry, metal ball.
Yurts are very pleasant structures. They're round and soft and moveable, just like the Death Star's soul.