Getting a fictional pet

Does anybody know how to get a fictional creature as a pet? And if so, will it obey my commands? The creature I want is vicious, aggressive, bloodthirsty, and destructive. Also, does anybody know how to take care of a fire monster that can't touche water?

It would all be imaginary.

A fictional animal is exactly that, fictional , they do not exist and so you cannot have one as a pet.
At best, fictional (mythical) creatures can be found as spirits, but even so, it wouldn't be a physical pet or animal, it would simply be a spirit that you work with.

not physically, but you could look into thought-forms or servitors. you pool your energy into a form to do a task, and provided you keep giving it energy, it should remain. [with servitors i'm told they disappear once their task is done, but i don't work with them so i wouldn't know] but if you're hoping for a real life pokemon/digimon/cartoon following you around, no, magick cannot contradict nature and you cannot create life from nothing.