Additional thoughts:

Othardian Primals: they seem to open up possibilities such as Fenrir, Alaxander, diabolos, and im sure a few more we would all love to see. Behemoth was also included in that video, another possible candidate for Mob type primals, the Beast king. (courels, hyenas, and hippocerfs... no im not gonna make that reference).

Siren is off the charts for me, and I'd be interested to hear more speculation on her for now id guess shes Othardian, But just for laughs I'll picture Qiqirn.

Speaking of laughs... since we already got Good King Moogle Mog, Good King Mog. I wantz Fat Chocobo!