Answer:
If I could be any fantastical creature I would choose to be a wizard. All the powers, the magic, and the natural charismas all wizards are just magically born with, that would make anybody's life easier.
Wizards have been in every folklore, from King Arthur, to Harry Potter, and everything in between, and they are almost always the most powerful and the smartest person around. Merlin, in King Arthur, has always the wisest advice and the greatest powers when compared to even Arthur himself. Another one is Voldemort. While evil Voldemort is the most powerful person in the world, and can make you do anytyhing, and can will anything in the world with a simple spell.
Why would it be useful to have a wizard in our modern world? Well, even though we have many fast, swift ways of communication, travel, and now even great sources of intelligence like computers, wizards bring something to the table none of these other things does. It brings a person, and a person can do so much more then a computer, or a train, or a phone, because it has a brain. A wizard's power could bring an end to world hunger, could form world peace, and could create such a power that nothing evil could touch the world, and harm it.
I think that if we could bring any creature to our modern world today, the most useful and the best option would be a wizard. Bringing many things to the table, and being someone who is relatble as a true human being, it would be amazing to have a wizard, who could provide a blanket of safety for everyone, and that is why I chose a wizard for bringing any fantastical creature alive.
Explanation: