Hmmm lets see:

Garfield: loyal (especially to Daddy), affectionate, intelligent & mellow

Gidget: stubborn (at times), affectionate, cautious & sweet

Rusty: timid (sometimes), silly, sweet & friendly

Fluffy: affectionate, lovable, gentle & clever

It is hard to only use 4 words to describe their characters. Different days different purrsonalities, but these describe most days.