People who like the idea of two characters being in a romantic relationship.
Shippers are usually very passionate about the romantic relationships they support in stories.
Examples:
She is a big fan of the Harry Potter shippers.
The shippers want the two characters to be together.
The shippers are happy when their favorite characters fall in love.
The shippers are always hoping for a romantic ending.
The shippers love to imagine romantic stories for their favorite characters.
The shippers dream of romantic moments for the characters they like.