Moogle's Poms?

[Cilia]

If I had to guess I'd say it's a source of bioluminescent light, a lure akin to anglerfish, or a way to attract a mate not dissimilar to bird plumage (though present on males and females alike). Flashy bits tend to be for attracting mates or warning other animals of danger, and well, moogles aren't all that threatening on average...

It's never been explained in-universe and honestly was probably just included in their design as a way to make them cuter... and has been present in every iteration of moogle in the franchise, so it would have to be on XIV's regardless of whether there's a lore explanation for them or not.

Decided to impulse roll on Okita's banner and my Devil's Luck kicked in, getting me Ozymandias!

Kept rolling with the leftovers and got a gold Saber... but it was just a third Mordred. :'(

[Fenral]

It's never been explained in-universe and honestly was probably just included in their design as a way to make them cuter... and has been present in every iteration of moogle in the franchise, so it would have to be on XIV's regardless of whether there's a lore explanation for them or not.

Objection! The FFIII Moogles in their Famicom incarnation (technically an unused asset from FFII) didn't have poms simply because of palette and resolution limitations, which were carried into their second appearance in FFV. Pomless Moogles abominations Mogs also appear in FFVII (and Crisis Core), and FFVIII. (Though MiniMog actually manages to rock the look better than one would expect.)

[Acehole]

A little tidbit I picked up yesterday in the lvl 45 WHM quest the moogle talks about having his pom taking off by kenna(sp?) mostly in jest and seems to imply it would kill him/her. This is when they were sent out to search for clues on the missing urn of a tama right before you get holy. Sorry I dont have a link to the specific dialog shouldn't be hard to find though.