The pages linked from here aren't completely up yet! I'm working on it! ~Demeta
Alonzo
Asparagus
Bombalurina
Bustopher Jones
Cassandra
Coricopat
Demeter
Ghengis
Griddlebone
Grizabella
Growltiger
Jellylorum
Jemima/Sillabub
Jennyanydots
Macavity
Mistoffelees
Mungojerrie
Munkustrap
Old Deuteronomy
Plato
Pouncival
Rum Tum Tugger
Rumpus Cat
Rumpleteazer
Skimbleshanks
Tantomile
Tumblebrutus
Victoria
Also, many productions have additional cats within the show. Take a look.