My masters are perfectly good - so long as they are fed, provided comfortable places to sleep and entertained they grant me plenty of strokes and even purr at me 
Fish I have had all different kinds of tropical species from small tanks with guppies up to a 5ft by 2ft by 2ft with a mixture of cichlids - Jack Dempseys, Convicts, Blue Accaras, Egyptian Mouth-brooders off the top of my head.
I had a pair of cockatiels for a while - used to love having them in the bathroom with me and giving them a bath after I had had one because they loved the water. I did re-home them because I felt bad they were in a cage when I could not let them fly free and a friend was building a proper outdoor aviary. They appreciated the move because they nested and laid eggs soon after they settled in.
As for insects - the only one we really kept as opposed to watching live naturally was an ordinary house-spider we popped in a little pet home tank and provided with flies - she got huge, bigger than I had seen one, on her life of no hunting and plenty of food. We let her go in the end to find a nice husband spider to munch on.
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