Invoked Spirits were pretty much lifeless dolls with tremendous potential. The potential stemmed from the content of the Mental Fragments used to create them. But, unless it was realised, this potential meant nothing.
In the example of a Cat Invoked Spirit, it might have the potential to move like a cat and execute extreme actions very rarely exhibited by cats. And the sheer difference originated from the fact that a cat had a flesh and blood body with its limitations while a Cat Invoked Spirit did not.
This meant that, without any limitation, a Cat Invoked Spirit was able to exhibit all traits of cats without any limit. And depending on the way it was created, it might be able to take a cat's abilities to the extreme.
But, this too was only potential. To realise it, the Invoker has to train, just like they did their own body. There were plenty of differences though.
