There has been much debate amongst the Fen scientific community for why Catgirls seem so easy to create as biomods, or occur so often on accident. One theory posits that the collective unconscious has latched onto Shuko's story as an Ur-example of an accidental biomod. Another theory points out the large number of cat-people in recent popular fiction. These theories goes on to state that the catgirling victims and later 'Daneside media portrayals have fed the pool making them more likely.
While one would think that catgirls would gravitate towards the furry fandom, the involuntary nature of the majority's transformation make them reluctant to join a group that so wantonly wants to be not human.
A catgirl is defined by two essential factors:
- One must be female, or present as such, to qualify for the girl part.
- One must possess feline features of some sort, with the usually agreed minimum being a pair of visible cat ears.
If one only meets the second condition, one is called a catboy. Since the Catgirling Machines only produce females, catboys are relatively rare.
- Sugar Rush
- An all-pop, all catgirl band, popular amongst teens.
- Catgirl Industries
- A mostly-catgirl research institute.
- In anime alone, Nuku-Nuku, Ichigo/Zoe in Tokyo Mew Mew, Merle in Escaflowne, Fam in Ruin Explorers, Neko-sensei in Princess Tutu, and Yuriko and Chinami in Mao-chan are a few of the many cat-people characters that are believed to have inspired cat-person biomods.