Blob Girl is a slime girl encountered in Chapter 2 of Monster Girl Quest. She lives in Undine's Spring and is one of many slimes who cannot live too far out from the pure area. Despite having a cold attitude, and being a slime, she is very voracious, carnivorous, and dissolves men after feeding on them traditionally. Apparently, her consistency is comparable to melted cheese, though there is not much else to say about her as her style of feeding is her main feature, though she is more powerful than the Jelly Girl from earlier. Not long before Luka visits Undine's Spring, the Blob Girl devoured a fisherman from Grand Noah. When Luka arrives, the Blob Girl attempts to make him her next meal. She is defeated and sealed into the form of a puddle. “A carnivorous monster of the slime race. The Blob Girl herself is made up of digestive juices. Any prey who’s taken into her body will never escape. As the man is stuck inside of her body, his semen is squeezed out while he’s slowly digested.

Her tone is light and friendly, but she’s extremely brutal. She seems to get sadistic pleasure from dissolving and feeding on men. She rarely wanders outside of her habitat, but is extremely dangerous.” she serves the heavenly knight queen slime and elemental water spirit Undine