The Blob was an independently made American horror/science-fiction film from 1958 that depicts a giant amoeba-like alien that terrorizes the small community of Phoenixville, Pennsylvania. Today, the film is recognized as one of the quintessential 1950s American sci-fi/horror films.
"An amorphous monster. Its body is a puddle of bubbly red liquid that grows larger and larger as it swallows people. It is weak against cold, but it's frightening regenerative powers allow it to reform itself even if frozen and shattered."
—Shin Megami Tensei IMAGINE compendium
Blob can be contracted in Kagurazaka Zhu Que Caverns bronze level, Ueno during the in-game day, Shinjuku Babel's docks area, Suginami Tunnels' silver and grey instances, and Shibuya's Celu Tower silver instance prior to the rebalancing. It appears as a boss within DB Watanabe and DB Saitou's hacked chip instances. It appears in Shinagawa during the weekends as part of the invasion forces.
Blob first appears in Manipura, when Serph and company go to meet with the Maribel. It is slightly unique in that unlike most demons, it will not start with a full MP pool. It will instead try to put the party to sleep with Dormina and leech their MP using MP Thief. It will finally pop off a Teradyne spell once it has stolen enough MP. Multiple unsuccessful attempts at putting the party to sleep will cause it to waste turns due to insufficient MP.
Blob is a common enemy in the first Idolasphere, Illusory Daitama, and appears as a Beast class. It has 10 attack and 9 armor. When defeated, it may drop the Performa materials Blob Force and Crawling Darkness.
Shin Megami Tensei: Liberation Dx2
"An amorphous gelatinous monster also known as "Shimi." Its body is a glob of bubbly blood red slime that grows ever larger with each human victim it melts to consume. It prefers warmth and humidity to the cold where it becomes sluggish. Simply freezing it will stop its movement completely."