White... snake? She is a strange one. XD
I think Hikaru's vocals are the best in
Hoshi no Uta,
sprinter,
love come down, and yes, definitely
ARIA.
It's a favorite of mine as well.
I didn't care much for Keiko's voice before
Red Moon though I did recognize the atmosphere and texture she bought to the songs. The title track is what turned me on to her voice and then her vocals in
Yami no Uta made me fall in love.
Wakana's great and all but I dunno... her vocals don't really grab me as much as the other two. The only songs she really sticks out to me in are
serenato,
I have a dream, and
Kimi ga Hikari ni Kaete yuku.