Ah, I just got out of school.
Yay! Interest!

So far, we've got about two of the Vongola Guardian spots that are definitely taken, and about three pending ones that I've yet to confirm. Here's the list as follows:

Sky - Possibly taken (Agni, who is also the tutor - pending)
Storm - Taken ([s]Octopus Head[/s] my right hand woman, Twilight)
Rain - Possibly taken (RainDash)
Sun - Possibly taken (Mousia, MIA - will be open if she doesn't return at some point)
Lightning - Taken (me, the boss)
Cloud - Open
Mist - Open