Mr. Happy explains it better than I do, or anyone else I've heard on the matter. So if you don't care to read my post, watch this:

https://www.youtube.com/watch?v=5yet1b5JNmE

My brain says Blue Mage. All the hints are there, Spiderman makes much more sense as a BLU reference than anything else. What's the first thing you think of when you hear "Spiderman"? Is it one of the directors from a movie trilogy? No. Is it dancing? No. It's some dude with the powers of a spider, that's literally the design of the character. Blue Mage simply makes the most sense given the shirt alone.

People gotta stop quoting an interview Yoshi did OVER TWO YEARS AGO as a reason for why it can't be BLU. He initially said RDM wouldn't work either, and here we are.

Also, you gotta remember that they benched Samurai from Ishgard because it didn't make sense thematically. SAM doesn't fit in Ala Mhigo either.

Dancer fans, sorry. Keep holding on to hope. Your time will come.