Timmy and Susie are two Tremorian Ghost siblings that met their untimely end when they were tragically splattered between the walls of a derailed railroad train. Unlike typical ghosts, Timmy and Susie exhibit unique behavior. They often appear by flashing in front of people, accompanied by two distinctive dings that mimic the sound of a railroad crossing sign. Their mischievous nature leads them to play pranks on humans in the living world by appearing before railroad tracks. Later, they form a friendship with a human named Hitoshi.
c2a NOTE: - After Hitoshi died, he became a ghost similar to Timmy and Susie. He started becoming sort of a big brother towards them. - Biff dislikes the two of them, he thinks they are too hyperactive and think that they are responsible for the train they were on killing them and everyone else.
