Since I don't know the exact 'under the bridge original story', I can't say for sure what the main characters are. It could be a lonely traveler who takes shelter under the bridge, or it could be a group of children exploring the area under the bridge.
I'm not sure which specific 'under the bridge original story' you are referring to. There could be many stories related to 'under the bridge'. It could be a story about a homeless person living under a bridge, or perhaps a mystery that takes place in that location.
The location under the bridge could be a place of isolation. It might signify that the girl is in a marginalized situation, away from the normal hustle and bustle of society.
I'm not sure which specific 'under the bridge' story you are referring to. There could be many stories related to something under a bridge. It could be a local legend about a hidden treasure under a bridge, or a story about a person's experience living under a bridge.
The song 'Under the Bridge' by Red Hot Chili Peppers was inspired by Anthony Kiedis' real - life experiences. He was struggling with drug addiction at the time. The 'under the bridge' referred to a place in Los Angeles where he used to go to get away from his problems and think. It was a very personal and emotional song for him.