Over thousands of years wizards lost their ability to communicate with magical beasts,animals and all kinds of creatures. As a result high elves,veelas,vampires and other magical beings refuse contact with humans. Humans who still have this ability are incredibly rare and coveted.
Enter Newt the first human empath in years who befriends any creature and is the perfect emissary to repair relations with the high council of magical beings. That is after apologising to him for the mess with the obscurial and trying to kill him first. Graves and Tina are appointed to protect him because there are forces at work who don't want a United magical world. Bonus for Newt being the adorable cinnamon roll that he is and Theseus having known about his little brother's abilities since Newt was born prematurely.