Melanie (メラニ Merani) is Laura's romantic partner.
Life of Heroes 3
This is the first time Melanie is seen in person. She breaks up with Laura shortly afterward.
Life of Heroes 4
During 4, Pinky and various other characters make references to her using recreational drugs.
This is confirmed when they break up, and Laura is impaled by the glass from one of Melanie's smashed bongs.