Concepts

Person who, upon skin-to-skin contact with another person, an invisible blade will automatically cut that person up. Wears gloves to prevent this.

Villain who acts all villain-y, but also shows a lot of empathy and compassion, to the point that they are obviously inherently a good person and not cut out to be a villain. Which then begs the question, why did they become a villain?

Human glowstick. Crack their joints, they start glowing.