The creature reveals a tragic backstory: he was created by a lonely toy maker and spent years wandering the streets looking for a true connection after his creator passed away.
The episode serves as a satirical look at toxic positivity and the human (or cat) tendency to be suspicious of those who appear perfect. Ultimately, Gumball and Darwin try to adopt Alan's attitude themselves, leading to the show's signature absurdist consequences. Episode 30: "The Friend"
Gumball and Darwin attempt to help her, but their intervention causes the "imaginary" friend to manifest as a real, physical—and somewhat terrifying—chimera creature.