What would you choose?

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I hope you have or were able to watch this anime but, basically, the characters involved here have mechanical allies which were referred as B't. They would take into forms from familiar animals, the main character has one as a horse with wings, a Pegasus would be an exact way of putting it. The one with a violin has a somewhat phoenix, and if you really watched it, you'd recall a huge turtle, a dragon or anything else that you could recall from the series. Now, if you were to choose what kind of animal, or mythical creature if you prefer, to be your ally, what would it be and why?