Persistent viscera. Specifically in Ninja Gaiden 2 on 360, any time you're killing humanoid enemies their blood and bodies will remain. And since you tend to backtrack in the game it's fun to go back through an area and be like "Yeesh, whoever killed these guys must be pretty twisted. Like some kind of cyborg ninja or something."
Logical hazardous surfaces. An example I'll cite is in Prey 2017, if you're on a metal surface that an electric phantom is also on you'll suffer shock damage, even if the phantom is one that you summoned as ally. Games have been getting better and better about utilizing this type of logic, as seen in stuff ranging from Divinity: Original Sin 2 to Bioshock to Enter the Gungeon where surfaces react to elements the way you expect them to.
@liquiddragon: The walk animations in 13 Sentinels is one of my favorite things about it.
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