Since the Creep Cat species used to be familiars for magic users, maybe they love and are attracted to being near Flora because being her familiar/pet would give them some sort of benefit to enjoy being in the human world, or extra creepycat powers?
Maybe she herself generates some sort of magic energy for them? She is targeted by a lot of supernatural beings.
What the HECKERS
Flora is more of a mystery than creepy cat himself
Also god damn it Oscar. I really wonder why the author is setting him up to be so unlikeable. All I can think of is some surprise reveal that it was all just misunderstandings but that would be... incredibly lame, at this point.