What monster would make the BEST pet?

The new monster manual is full of ferocious and terrifying monsters that your adventures will fear for the rest of their lives. But, it is also full of cute and adorable creatures that you can't resist! What one do we think is the best?---------------Music provided by Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/by/4.0Music also provided by Monument Studios