Whip Master

[Nihilarian]

That reminds me, Nih, I still need to do that Tamer prc someday.

Indeed. Due to PF's approach to the animal companion, if you want to grant a behemoth as a pet, you'll have to write up new stats, which is unfortunate. PF's AC is probably more balanced, but there's nothing quite like opening up the monster manual to the T-Rex using it straight out of the box.

But I digress. A flayer base class would be difficult to create. We have no information on what they would have done, and the closest the Final Fantasy games have is the Beastmaster (which, in this system, is an unarmed berserker type). I guess Beastmaster could be split into two ("Savage", an unarmed barbarian class, and Beastmaster, a whip wielding monster summoning class with an animal companion) but that seems like a lot of work.