Alright, my thoughts:
Samurai: Interesting, probably my second choice, but it would just look weird for them to defend the Emperor or any modern public official seeing as their last gasp was in trying to defend the Shogunate.
Winged Hussars: Just plain cool. Top pick.
Tercio: The issue is that it’s not distinctive in its component units, only a drab swordsman or musketeer or pikeman. Only when a company or the whole unit is assembled does it look impressive.
Landsknechts: After what they did to Rome, they can rot in Hell for all I care.
Hartschier: Very nice... but what would you have them do? Bayern doesn’t exactly have a head of state anymore.
Janissaries: You want to restart WHAT?!

That’s just plain illegal under a whole rafter of modern laws.
Caroleans: How different would they look from the present Swedish Royal Guards?
Musketeers: A solid choice, but France already has the ceremonial cuirassiers. Can both exist at the same time?