I definitely wouldn't fit into the role of Inu-Yasha... come to think of it, I'm not sure who I most resemble in that show...

I see Koga (the wolf-demon) hasn't been cast yet. I don't fit him either (the unreciprocated 3rd party in the nonexistent love triangle between him, Inu-Yasha and Kagome.)

Kirara (or Kilala, depending how you feel like romanizing) is the flying kitty's name you seek. :D

And if we have a Sesshomaru, we gotta have a Rin to exploit that tender side he hides so well the rest of the time.

How about the Thunder Brothers' little sister... (forgot the name) Kohaku (Sango's kid brother), Sota (Kagome's kid brother and Inu-Yasha worshipper), how about Kagome's grandfather? Lots more supporting characters to cast!