[quote=@Darcs]
If I were to make an 'angel' (the City Council tells me angels aren't real) could it align itself with one of the seven heavenly virtues?
[/quote]

There's no rule saying you can't! Although the rules do state that, while in Human form, angels don't get any spectacular powers - they'd have to combat the Sins using mere moral support.

I myself am planning on making an Angel character, but even with two I think they'll have their work cut out for them.