The phrase "romantic lead" refers to the main character in a story or movie who is involved in a romantic relationship or storyline. They typically play a central and appealing role in the romantic aspect of the plot. Full definition
In fact, while the duo sounds like a comedy dream team on paper, they have zero chemistry as romantic leads, which makes their inevitable hookup even more awkward as a result. (blog.bullz-eye.com)
She is over 50 and still plays romantic leads. (sfchronicle.com)
He doesn't make for a great romantic lead character but that's okay — because this isn't a great romance. (fextralife.com)