Mean Slinks

Antagonist is seductive, and to drive that point home, mean guys can be elegant, creepy, or sexy. Some bad guys even combine those traits in different combinations, giving you creepy-sexy mean guys as just one example. Not all mean slinks are evil because they usually considered neutral characters.

To further underline the seductiveness and underscore the temptation of mean, some Mean characters also seem to share a certain kinetic trait: body language that implies a certain gravity-defying elegant grace, a boneless, flowing, fluid manner of movement.

It can be sexily alluring, or unnervingly disturbing, but serves as a visual cue to a viewer that a character who moves in this manner is sliding away or completely removed from what we consider "their humanity", and as such is not a sympathetic character to root for.

In more supernatural cases, the villain does literally and voluntarily shift from solid to liquid or gas at will. Villains who are animals can display this trait honestly as it will often be a species trait: eels, reptiles (especially snakes), weasels, cats and rats all slink.

Occasionally, due to them not being able to help how they move — and bad reputation — you may encounter slinky animals who are neutral or good despite what it may look like when they move.

The trope is most commonly applied in animated fare, but it does make appearances in live action as well.