All this from one sci-fi show:

A love slave who is part brain-eating lizard and will start trying to eat people from the neck up when stressed.

An angry, verbally abusive robot head without a body.

A parasitic plant that takes the form of a beautiful and seductive woman.

An angsty, good-looking assassin who just happens to be undead and dependent on strange dark goo flowing through his veins.

...there was more but I've forgotten it.