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Puffy Fluffy is a nudibranch and can transform into a vicious snake head fish/Dunkleosteus form. In each version, he is very different.
Big shiny light purple eyes
Cyan fins and tail
Pink and puffy lips
Light green body
Pink blushes on both cheeks
One small triangular tooth
Does not get along with other pets
Long, Slender and sluggy (round) light green body
Long, jagged teeth
Multiple tongues with mouths inside
Light blue giant fins and tail
Tongues tend to be sensitive to pain (As seen when Gary yanks the tongues)
SpongeBob bought him so that Gary would not be lonely while he was working at the Krusty Krab, but he turned out to be a monster, hence nudibranches are dangerous around other pets. SpongeBob was ignorant of the situation and failed to notice anything wrong with Puffy Fluffy and blames Gary, even after seeing his monster form, while Gary was wrapped up by its tongues and was about to be eaten. SpongeBob was also about to be eaten but remained oblivious, even after Gary saved him. Puffy Fluffy ran away after Gary tied up its tongues together with a leash. This then caused Puffy Fluffy to run away due to Gary tying up Puffy Fluffy and SpongeBob blamed Gary for making Puffy Fluffy run away.
Nudibranches, which is what Puffy Fluffy is, are actually sea slugs.
His multiple tongues might be a reference to the Graboids from Tremors.
When getting Puffy Fluffy from the gypsy, she says something about it being dangerous. This is possibly a reference to the movie Gremlins, in which a man buys a strange pet from a Chinese shop owner, which refuses to sell it to the man because it is dangerous.
Nudibranches appear as the main antagonists in the online game, "Gary's Revenge."
Puffy Fluffy's monstrous and vicious behavior was actually warned to SpongeBob by the gypsy selling the nudibranches, but he completely ignored her and took one without even paying.
Due to the vivid resemblance of Puffy Fluffy to mogwai (and gremlins), it was probably midnight or after midnight when he transformed (because of eating). This is the same case as the mogwai from Gremlins.
In Croatian dub, his name is "Čupavko" which means "Hairy."