By all accounts, the individual in question is a wandering minstrel come to Vylbrand from as yet unknown shores. If rumors can be given credence, he is capable of influencing the humours of goobbues by way of an enchanted horn, one whose distinct sound beckons the creatures and tames them besides.
So the NPC will be somewhere in LaNoscea. I wonder if he is up already and hidden somewhere in the wilderness

Also, are all the Goobues the same size, unlike Chocobos that are scales to character model?