I see so much awesome ready to be awaken. The potential is there but the awakening will be harsh. Reisen's lunatic eyes and alice's doll skills. Youmu swordsmanship and yuyuko's ability of death. Marisa's ability for magic and reimu's spiritual powers. And Sakuya's time stop and knives skill with Meilings prowess for martial arts. Why ass just needs to sign up for the kicking.
It's like the group Negi has before the Chao Bao Zi arc in Magister Negi Magi. Mismatched and short on experience, but with potential for high levels of badassery. They don't get to play with Flan just yet~
I like Alice and Patchouli paired together, honestly...
But anyway, I can't see Reimu's powers translating as a "White Mage", and I DEFINITELY don't see Marisa's powers translating that way. She's also holding up a Ying Yang Orb, which is actually used psuedo-physically as a weapon. (Although I guess you could say it's a weapon whose damage is based on the "mind" stat or equivalent.) Barrier-related powers (and magic-based normal attacks) don't have much representation in Final Fantasy, so hers is the hardest to pin down, but I see her as an offensive magic class with some physical ability.
Using Final Fantasy Tactics A2 class system, I'd look at this, and say that Youmu-Yuyuko would be Parivir+Seer.
If you don't mind making the human's kids into a Viera, Reimu-Marisa, I'd see as Red Mage+Summoner. If human, though, considering Marisa's reputation, I'd say Blue Mage + either another Seer or Black Mage.
Meiling-Sakuya looks fairly clear on Master Monk, the second job is a little more difficult... Templar, maybe? Sakuya would definitely have Juggler+Time Mage as her job set, though...
Alice-Reisen... She's using dolls, not finger-guns, apparently, so I guess her powers are in her eyes and dolls. Definitely magical, but doesn't translate well. I kind of want to say "screw it" and declare Illusionist+Time Mage, just because I would never make a serious party without a time mage.
It would be nice if they were the new stage bosses in ten desires or better would be if there are the kids of all people in gensokyo the stage bosses or so...