Hm, that's kind of cool. Especially for a kitten who thinks she's fierce! (this is for a girl, right?)
Anyway, I don't think you should spell Chimaera with a K. Maybe use Chimaera as the middle name and use a K fn?
Kore Chimaera, Kita Chimaera,
Kira Chimaera, Kerewin Chimaera,
Kassia Chimaera? Or just use
Casey as the nn.