As has been pointed out - stuff goes in waves, all over the place. When some cable channel had a marathon of Naruto, we had a flood of Naruto style characters.
Vampires and rules - it's not just rule books that have vampires weakened or killed by daylight. It's tradition, stories and legends. But, on that point, I've asked this before, and never really got an answer. . .back on Wizards, we had a function of /time - where we could see what time it was in the room (and, thereby, the time of day for the setting). CRT was in the Pacific time zone for purposes of figuring out where the sun was in the sky. I asked if it still is. Don't know the answer to that.
So, at least for Ariel, she can prance around in the daylight, 'cause her player is on the other side of the world from the majority of the players (at least the majority of those who speak up when locations are asked). Well, okay, if I go by what time it is *right now*, it's daylight in both places

. . . Yes, I'm being silly. But, I'd still like to know round about what time zone the fantasy settings are in. It makes it easier to interact if we at least have some common reference point.