Lon Suder

Ensign Lon Suder was a villain/proxy-hero in Star Trek: Voyager, until (spoiler) he died.

Appearance
Suder has fair skin, dark, slicked-back hair, and a Starfleet engineering uniform.

Personality
Suder has a fascination with botany, but other than that, he has an eerie lack of emotions. He doesn't really care about death and once murdered someone just because he didn't like the way he looked at him.

Trivia

 * Despite being a Betazoid, he doesn't have any telepathic abilities.