Can you identify this culprit?

[D'Snowth]

It was definitely Joey Mazzarino.

 

[BEAR]

D'Snowth is correct he was performed by Joey M. You can tell because it sounds exactly like Stinky. We have been over this before several times though.

 

[zanimum]

...but I believe that Carina the Ballerina is a one-time character.

I don't know, she was a little better designed than your average "Anything Monster". Perhaps they were testing her for use in an international version of the show.