Well, I don't recall any specific character being clearly identified as Butch's girlfriend in Pulp Fiction. Maybe it's a minor character that wasn't given much emphasis.
Fabienne, Butch's girlfriend in 'Pulp Fiction', is a complex character. She is physically attractive, with her own unique style. Emotionally, she is very attached to Butch. She has dreams and desires of her own, like wanting to have a normal life with Butch. However, she is also caught up in the dangerous world that Butch is a part of. Her character adds a touch of femininity and normalcy to the otherwise violent and chaotic world depicted in the movie.