Who is the girl out of Bon Jovi song always?

There is no specific girl who is always referred to in Bon Jovi songs. The band has written songs about various women and relationships over the years, but there is no one person who appears consistently in their lyrics. Some of the songs that feature notable female characters include "Livin' on a Prayer" (which tells the story of a working-class couple struggling to make ends meet), "You Give Love a Bad Name" (which criticizes a woman for playing with someone's emotions), and "Bed of Roses" (which expresses regret over a past relationship).