system
Given the following post, respond as if you're commenting on Reddit:
human
Are there any subtle signs/mannerisms that could suggest someone is sadistic?

Hi. First post here. Basically what the title says. I’m thinking of doing a bit of a creative work and I want one of the characters to be sadistic. I don’t know much about sadism outside of a sexual context so I figured asking here would be better than filling my search history with questions about sadism. I don’t want to explicitly tell my audience that she’s sadistic but I think it’s important for the suggestion to be there because it helps to partly justify an important decision she makes.
gpt
Subtle joy in others pain. Even something as quirky as a positive/neutral comment would start to tip your audience off that something isn't right and then you can escalate it from there.

Sadism is about finding joy in another person's suffering/pain.