Kirkbait

"Kirkbait" is a term used to represent any supporting female character that exists primarily to interact with and be seduced by the male lead. She often has some impact on the plot but usually revolves around or is heavily influenced by the male main character.

This term originates from the character Captain James T. Kirk from the original series of Star Trek which was first aired in the 1960s. Kirk was well known for seducing and being seduced by women across the galaxy.