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Tips for adding emotion/drama to characters without doing much at all: 1) Give them an off-camera gaze.
Here's another good example of 1. But also 2) Give them a weapon they might use but currently aren't.
3) Hide their eyes in shadow.
4) Suggest movement around the character while the character stands still. So by doing this one, you can make the character seem like they're standing their ground against danger. The easiest way to do this is with wind.
