Big true, nice observation!
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Here's Bozja- Queen Gunn is that paler blue but it's distinctive and not a solid glow.
https://lds-img.finalfantasyxiv.com/...9ffd873442.png
And the tempered soldier, again a darker blue.
https://lds-img.finalfantasyxiv.com/...be40eba869.png
But I think there are overworld mobs that have those solid glowing eyes so it's probably not supposed to be a possession/primal problem.
But it is "Boar of Paradise", the rare mob variant much like the Black Chocobo or Yellow Coblyn or Weird Spriggan.
Surely it's just a coincidence...
I might be worried if the boar crackles with blue energy and produces a voice that says "I am assuming direct control" though...